Log Message:
Update to 1.5.3 (basically bug fixes since 1.5.1).

PostGIS 1.5.3
2011/06/25

 - This is a bug fix release, addressing issues that have been
   filed since the 1.5.2 release.
 - Bug Fixes
   - #1056, produce correct bboxes for arc geometries, fixes index errors
         (Paul Ramsey)
   - #1007, ST_IsValid crash - fix requires GEOS 3.3.0+ or 3.2.3+
   	 (Sandro Santilli, reported by Birgit Laggner)
   - #940, support for PostgreSQL 9.1 beta 1
     (Regina Obe, Paul Ramsey, patch submitted by stl)
   - #845, ST_Intersects precision error (Sandro Santilli, Nicklas Avén)
     Reported by cdestigter
   - #884, Unstable results with ST_Within, ST_Intersects (Chris Hodgson)
   - #779, shp2pgsql -S option seems to fail on points (Jeff Adams)
   - #666, ST_DumpPoints is not null safe (Regina Obe)
   - #631, Update NZ projections for grid transformation support (jpalmer)
   - #630, Peculiar Null treatment in arrays in ST_Collect (Chris Hodgson)
     Reported by David Bitner
   - #624, Memory leak in ST_GeogFromText (ryang, Paul Ramsey)
   - #609, Bad source code in manual section 5.2 Java Clients
    (simoc, Regina Obe)
   - #604, shp2pgsql usage touchups (Mike Toews, Paul Ramsey)
   - #573 ST_Union fails on a group of linestrings
   	 Not a PostGIS bug, fixed in GEOS 3.3.0
   - #457 ST_CollectionExtract returns non-requested type
    (Nicklas Avén, Paul Ramsey)
   - #441 ST_AsGeoJson Bbox on GeometryCollection error (Olivier Courtin)
   - #411 Ability to backup invalid geometries (Sando Santilli)
     Reported by Regione Toscana
   - #409 ST_AsSVG - degraded (Olivier Courtin)
     Reported by Sdikiy
   - #373 Documentation syntax error in hard upgrade (Paul Ramsey)
     Reported by psvensso

PostGIS 1.5.2
2010/09/27

 - This is a bug fix release, addressing issues that have been
   filed since the 1.5.1 release.

 - Bug Fixes
   - Loader: fix handling of empty (0-verticed) geometries in shapefiles.
     (Sandro Santilli)
   - #536, Geography ST_Intersects, ST_Covers, ST_CoveredBy and
     Geometry ST_Equals not using spatial index (Regina Obe, Nicklas Avén)
   - #573, Improvement to ST_Contains geography
   - Loader: Add support for command-q shutdown in Mac GTK build (Paul Ramsey)
   - #393, Loader: Add temporary patch for large DBF files
     (Maxime Guillaud, Paul Ramsey)
   - #507, Fix wrong OGC URN in GeoJSON and GML output (Olivier Courtin)
   - spatial_ref_sys.sql Add datum conversion for projection SRID 3021
     (Paul Ramsey)
   - Geography - remove crash for case when all geographies are out of
     the estimate (Paul Ramsey)
   - #469, Fix for array_aggregation error (Greg Stark, Paul Ramsey)
   - #532, Temporary geography tables showing up in other user sessions
     (Paul Ramsey)
   - #562, ST_Dwithin errors for large geographies (Paul Ramsey)
   - #513, shape loading GUI tries to make spatial index when loading DBF only
     mode (Paul Ramsey)
   - #527, shape loading GUI should always append log messages
     (Mark Cave-Ayland)
   - #504 shp2pgsql should rename xmin/xmax fields (Sandro Santilli)
   - #458 postgis_comments being installed in contrib instead of
     version folder (Mark Cave-Ayland)
   - #474 Analyzing a table with geography column crashes server
     (Paul Ramsey)
   - #581 LWGEOM-expand produces inconsistent results
     (Mark Cave-Ayland)
   - #471 DocBook dtd errors (Olivier Courtin)
   - Fix further build issues against PostgreSQL 9.0
     (Mark Cave-Ayland)
   - #572 Password whitespace for Shape File to PostGIS
     Import not supported (Mark Cave-Ayland)
   - #603: shp2pgsql: "-w" produces invalid WKT for MULTI* objects.
     (Mark Cave-Ayland)
 - Enhancement
   - #513 Add dbf filter to shp2pgsql-gui and allow uploading dbf only
     (Paul Ramsey)