darktable 1.6.7

this is a point release in the stable series. the sha256sum is

a75073b49df0a30cd2686624feeb6210bc083bc37112ae6e045f8523db4c4c98 darktable-1.6.7.tar.xz
6630230049e6d2c4cdfd39585f95fbd1ee439a8dad107f7332aefeb1dd75b831  darktable-1.6.7.dmg

and as always, please don't use the tarballs provided by github (marked as "Source code").

security
libraw CVE-2015-3885: fix integer overflow in ljpeg_start()

miscellaneous
improvements to facebook export
interpolation fixups
demosaic code cleanups
slideshow should handle very small images better
improve olympus lens detection
various minor memory leak fixes
various other fixes
pentax (k-x) dng old embedded preview left over is now removed
modern osx display profile handling

camera support
nikon d7200 (both 12bit and 14bit compressed NEFs)
nikon coolpix p340
canon eos 750d
canon eos 760d
canon eos m2
panasonic dmc-cm1
panasonic dmc-gf7 (4:3 only)
olympus xz-10
olympus sp570uz
samsung nx500
fuji f600exr

aspect ratios
pansonic dmc-g5
panasonic dmc-gm5
panasonic fz200

wb_presets
nikon d7200
nikon coolpix p340
panasonic dmc-gm1
panasonic dmc-gm5
olympus e-m10 (updated)
olympus e-pl7
olympus xz-10

noise profiles
panon powershot G9
sony a350

basecurves
nikon d7200
nikon d7000
nikon d750
nikon d90

translations
catalan
german
spanish
swedish