Log Message:
Update to 1.5.1, provided by Leonardo Taccari in PR 50015:

Changes:
1.5.1 (2015-06-01)
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(None)

1.5.1-RC1 (2015-05-08)
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- Fix: Do not consider road junctions with trivial dead ends as branch points \ 
during town growth [FS#6245] (r27260, r27259, r27244)
- Fix: ScriptList::RemoveList failed to remove a list from itself [FS#6287] (r27258)
- Fix: Combined button+dropdown widgets in order and autoreplace GUI had \ 
incorrect hitbox when using GUI zoom [FS#6270] (r27255)
- Fix: When building a lock on DC_AUTO-removable water-based objects, the water \ 
class was always set to canal [FS#6264] (r27254)
- Fix: When crossing tram tracks with railroads, cost of extra roads was not \ 
being counted [FS#6282] (r27253)
- Fix: Invalid infrastructure counting when crossing tram tracks with railroads \ 
[FS#6281] (r27252)
- Fix: Broken error message in configure [FS#6286] (r27250)
- Fix: In some cases town growth failure was considered as success [FS#6240] \ 
(r27249, r27247)
- Fix: Town labels on smallmap and zoomed-out viewports were not centered \ 
[FS#6257] (r27248)
- Fix: Removing a rail waypoint used the remove-rail-station cost [FS#6251] (r27245)
- Fix: Duplicate frees due to pool item classes not having copy constructors \ 
[FS#6285] (r27243)
- Fix: Crash when no AIs were installed due to improper handling of non-ASCII \ 
characters by the string pointer lexer [FS#6272] (r27233)
- Fix: Compilation on DragonflyBSD [FS#6274] (r27224, r27223)
- Fix: Use the current maximum speed as limited by bridges, orders etc. for all \ 
vehicle types alike when considering increased smoke emissions of vehicles \ 
[FS#6278] (r27222)
- Fix: Multi-value keys in the desktop entry shall end with a trailing separator \ 
(r27221)
- Fix: Draw path reservation on the whole bridge, not only on the bridge heads \ 
(r27209)
- Fix: Draw correct overlay sprites for path reservations on bridges and tunnels \ 
(r27208)

1.5.0 (2015-04-01)
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- Fix: [NewGRF] Add Misc. GRF Feature Flag 6 to enable the second rocky tile set \ 
[FS#6260] (r27200)

1.5.0-RC1 (2015-03-18)
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- Feature: [NewGRF] Display relative offset changes in the sprite aligner \ 
[FS#6236] (r27174)
- Fix: Original road vehicle acceleration crashed for vehicles taking over \ 
[FS#6255] (r27190)
- Fix: GCC 5 compilation (r27185, r27183)
- Fix: Data race due to lazy initialisation of objects [FS#5969] (r27178)
- Fix: Compilation with MinGW64 (r27176)
- Fix: Use the regular clipping functions in the sprite aligner instead of some \ 
magic [FS#6237] (r27173)
- Fix: Windows randomly drops SetCursorPos calls, breaking the RMB-scrolling \ 
[FS#6238] (r27172)

1.5.0-beta2 (2015-02-24)
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- Feature: [NoGo] Game scripts can point to a location, station, industry, or \ 
town when publishing news (r27164)
- Feature: Allow changing max heightlevel in scenario editor (r27151)
- Feature: Make use of both rocky tile sets from the base graphics (r27117)
- Change: Scale (non-custom) default window sizes according to GUI zoom (r27147)
- Change: Make statusbar and chat-entry window use the same width as the toolbar \ 
(r27146)
- Change: The chatbox-width setting now uses percent of screen width instead of \ 
pixels (r27144)
- Change: [NewGRF] Interpret negative positions in industry layouts depending on \ 
GRF version (r27138)
- Fix: [SDL, Windows] Right-mouse-button scrolling scrolled/jumped too far, when \ 
OpenTTD lagged during mouse event processing (r27167)
- Fix: Toolbars were not invalidated when changing max-vehicles settings \ 
[FS#6204] (r27163)
- Fix: Tile selection was drawn outside of map in some cases [FS#6208] (r27162)
- Fix: Reimplement the viewport drawing algorithm [FS#6156] [FS#6206] (r27161)
- Fix: Issues with smallmap and viewport coordinates and transformations \ 
(r27160, r27159, r27158)
- Fix: Mark bridge middle tiles dirty when building/removing/changing bridges \ 
(r27157)
- Fix: Rounding and unit-conversion inconsistencies in calls to \ 
MarkAllViewportsDirty (r27148)
- Fix: Oilrig empty-tile checks were incorrect due to wrong \ 
TileIndexDiff->TileIndexDiffC conversion (r27137)
- Fix: Misalignment in generate world window in case of small fonts (r27135)
- Fix: Dragging of free wagons in depot failed with GUI zoom (r27133)
- Fix: Reduce memory footprint of map array by shuffling its members [FS#6218] \ 
(r27132, r27126)
- Fix: Dropdown- and tooltip-windows should not steal the focus (r27131)
- Fix: [NewGRF] Action 7/9 condition 0A failed for present, but disabled, NewGRF \ 
(r27119)
- Fix: Road vehicles could not reverse to be sent to depots when the following \ 
tile has the right type to run on, but could not be entered [FS#6183] (r27107)
- Fix: Use the actual max speed of the vehicle in front when determining if a RV \ 
can overtake [FS#6176] (r27106)
- Fix: grow_counter was not properly bounded by growth_rate, but by some other \ 
value used to calculate growth_rate [FS#6195] (r27105)
- Fix: [Script] Support 64 bits integers in ScriptLists [FS#6194] (r27104)
- Fix: [Script] Money values would end up wrong in strings when outside the \ 
bounds of a 32 bits integer [FS#6194] (r27102)

1.5.0-beta1 (2014-12-24)
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- Feature: Support .txt.gz and -txt.xz changelog, readme and license files in \ 
basesets, NewGRFs, etc (r27035, r27034)
- Feature: More height levels [FS#4126] (r27010)
- Feature: Latin translation (r26993)
- Feature: Add option to choose normal, double or quad-size interface (r26990)
- Feature: [Script] Swap method for script lists (r26894)
- Feature: [Script] ScriptStationList_Cargo for sorting cargo by from and via \ 
(r26893)
- Feature: [Script] API for retrieving planned flow (r26892)
- Feature: [CargoDist] Predict links for station-autorefitting vehicles (r26889)
- Feature: Setting for limiting the height of bridges (r26882)
- Feature: Make aircraft ascend/descend when they are too close to the ground or \ 
too far away (r26866)
- Feature: Allow hiding of non-interesting engines in the GUI (r26805, r26804)
- Feature: Vehicle sorting in autoreplace GUI [FS#1640] (r26800)
- Feature: [NewGRF] Advanced visual effects with multiple effect sprites \ 
independent of spawning model (r26988, r26747)
- Feature: Warn about missing industries after generating a map (r26729)
- Feature: Upgrade currently active NewGRFs to newest installed version (r26613)
- Feature: Save and load grfid and md5sum of NewGRFs in config file (r26611)
- Feature: Select an editable preset name for saving (r26610)
- Feature: Cancel cargo delivery from industries/houses to stations after about \ 
21 months of not having picked up any of the cargo (r26582)
- Feature: Give a warning when a plane's orders tell it to use a runway which is \ 
too short for it [FS#6009] (r26566)
- Feature: [Script] Extended API for CargoDist (r26557)
- Feature: Show measured order times in timetable GUI also when not timetabled \ 
(r26550)
- Feature: Prompt for confirmation when deleting a vehicle group (r26455)
- Feature: Hierarchical vehicle subgroups (r26450)
- Feature: Allow more sound sleep for dedicated servers when there's nothing to \ 
do and nobody paying attention (r26449)
- Feature: [NewGRF] Add vehicle modflag 1 (unloading in progress) (r26430)
- Change: Improvements to the man page (r27091, r27012)
- Change: Allow to set the granularity of the tooltip hover time in milliseconds \ 
instead of seconds. New default value is 250ms (r26815)
- Change: Follow SI recommendation about spaces between numbers and units \ 
[FS#6086] (r26733)
- Change: [CargoDist] Save locations instead of distances in link graphs to \ 
reduce size (r26646)
- Change: [Squirrel] Make the internal integer for scripts always 64 bits, so \ 
scripts behave the same on 32 and 64 bit architectures and money can be \ 
represented properly (r26585, r26584)
- Change: Reshuffle advanced settings tree (r26614, r26536)
- Change: Add backend-independent config-file setting to disable 8bpp video \ 
modes, and disable 8bpp by default (r26522)
- Fix: [OS/2] Compile again [FS#6186] (r27092)
- Fix: Compilation with freetype2 version 2.5.4 and newer [FS#6185] (r27079)
- Fix: Variable 47 used the carge translation table of the wrong GRF in case of \ 
callback 1D [FS#6182] (r27075)
- Fix: Some lists did not use natural string sorting [FS#6172] (r27063)
- Fix: Mercurial version detection failed if personal presets were configured \ 
(r27059)
- Fix: [OSX] Don't require double-press from non-dead console hotkeys [FS#5812] \ 
(r27046)
- Fix: Crash when having the vehicle list opened from a buoy or oil rig when the \ 
buoy/oil rig is removed (r27030)
- Fix: Unit number was not always fully shown in depots [FS#6102] (r27014)
- Fix: [CargoDist] Reserve cargo only after unloading finished or if the vehicle \ 
has the desired cargo already [FS#6110] (r26918)
- Fix: [Squirrel] Loading a value saved as boolean caused it to be of type \ 
integer instead of boolean (r26785)
- Fix: [Squirrel] Harden string handling (r26777)
- Fix: [OSX] Implement more of the text editing API to prevent crashes and \ 
improve IME support [FS#5972] (r26758)
- Fix: Incorrect saving of order backups [FS#6066] (r26700)
- Fix: Ordering a vehicle to a competitor's rail waypoint displayed an error \ 
message. Ignore the click as is done for the other order types to competitor's \ 
stuff [FS#6059] (r26692)
- Fix: [Script] Loading/parsing of info .nuts was done in the same VM, causing \ 
e.g. constants to break the loading of info of other scripts [FS#5973] (r26617)
- Fix: [CargoDist] Improve estimation of link capacitites (r26549)
- Remove: A bunch of archaic settings from the GUI (r26528, r26526, r26525)