Port iop/profile_gamma.c from simple_gui
Drop simple_gui
Unbounded processing for profile_gamma
OpenCL kernel for profile_gamma
Add a few more error messages to db locking

This could be useful when things don't work as expected. STDERR only.
introspection: don't fail in perl code on OSX
Convert some #defines with values like 2**x to enums with bitshifts
Italian translation updated
Merge pull request #490 from bartokk/master

Italian translation updated
exif: eee6642 only for bleeding edge lensfun
(cherry picked from commit e710949c915a0f2476d4cb3fbdea9e90af69d074)
rawspeed: samsung nx1100
Convert rest of blend params to enums
Convert some more #defines to enums
cmake: exec_program is deprecated
Merge pull request #491 from darktable-org/drop-simple_gui

profile_gamma rewrite  & simple gui drop
IOPs are now compliant with -Wdouble-promotion

http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wdouble-promotion-292
Fix da.po permissions.
Updated Dutch translation
Do not force anyone to use -Wdouble-promotion
introspection: Fix compile with clang-3.3

It seems that only oldish g++-4.6 doesn't like some of our generated
code (the part about initializing unions).