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Update homepage from berlios to sourceforge.

(I can't find any evidence that lensfun has abandonded sourceforge
yet, but if I'm wrong please let me know.)

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Update MASTER_SITES to ${MASTER_SITE_SOURCEFORGE:=lensfun/}

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install_name_tool must be used on OS X

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Bump applications PKGREVISIONs for python users that might be using
python3, since the default changed from python33 to python34.

I probably bumped too many. I hope I got them all.

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Changes 0.2.8:
Another minor maintenance release. Most fixes were related to the build system.
But as always we have many(!) new lens profiles.

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GNU Make check is broken -- does not recognize 4.0 as newer than 3.81.
http://developer.berlios.de/bugs/?func=detailbug&bug_id=19153&group_id=9034

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Fix building on Darwin

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png.h no longer includes string.h.

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Update to 0.2.7.  Tested with ufraw and a Samsung NX100 image from the
ufraw user who was having trouble on ubuntu.

Upstream NEWS content from web page:

Most important: some bugs leading to imprecise results when processing
extreme values, e.g. from fisheye lenses, were fixed. Thanks to
Torsten B. for working on this!

Apart from that we got several new lenses and camera profiles:
New DSLR and mirrorless camera lenses:
Canon EF 50mm f/1.8 II
Canon EF-S 18-55mm f/3.5-5.6 IS II
Nikkor 16-35mm f/4G ED-AFS VR
Sigma 18-200mm f/3.5-6.3 II DC OS HSM
Sigma 50mm F1.4 EX DG HSM
Sigma 70-300mm F4-5.6 DL Macro
Minolta/Sony AF DT 18-70mm F3.5-5.6 (D)
OLYMPUS M.12-50mm F3.5-6.3
Sony DT 18-55mm F3.5-5.6 SAM SAL 1855
Tamron SP 24-70mm F/2.8 Di VC USD
Tamron SP AF 10-24mm F/3.5-4.5 Di II LD Aspherical IF
Tokina AT-X Pro DX 11-16mm F2.8
LUMIX G 14mm F2.5
Sony E 16mm F2.8
1Sony E 18-55mm F3.5-5.6 OSS
Sony E 50mm F1.8 OSS
Sony E 55-210mm F4.5-6.3 OSS
Sony VCL-ECF1 fisheye converter

New compact cameras:
Canon G15
Fuji FinePix F200EXR
Nikon COOLPIX P60
Olympus XZ-1
Panasonic DMC-LX5 4:3
Sony DSC-RX100, RX100

Log message:
Drop vestigial patch-ac.

Most of this had been applied upstream (or was taken from upstream).
The only thing left was adding an include of string.h, but it builds
w/o warnings without it, so that appears no longer necessary.