collect: fix date and add a 'time' filter.
Don't crash when GPSLatitudeRef is missing

Same applies for GPSLongitudeRef. This fixes #9222.
module levels: colorpickers will not take action before user clicks in image

this required a small extension to colorpickers: if in point mode and at least
one of the coordinates is negative it will behave as a noop
usermanual: update on dithering
levels: fix for commit #9241 (Regression in auto mode)
make module densitycurve aware of new histogram code
cleanup: fix segfault with strcat.
osm_gps_map_image_get_zorder: Change return type to "gint"

... instead of "const gint".

The returned value is a scalar, not a pointer, therefore it's copied.
The "const" qualifier is unneeded and even breaks the build with older
GCC such as 4.2.

This fix was reported and committed upstream:
https://github.com/nzjrs/osm-gps-map/commit/a12c703180e0ea6c80a4781a084be470d006b498
Once again, fix build issue with libintl, GCC and *BSD

I still don't understand what's going on here, but this workaround seems
enough for now.

In the end, here's what we do on *BSD systems:
    o  clang: don't link with libintl
    o  GCC 4.2: don't link with libintl
    o  GCC 4.3+: explicitely link with libintl

This was tested on FreeBSD 9 & 10, with clang 3.2 (on FreeBSD 10 only,
using the default compiler), GCC 4.2 (base compiler) and GCC 4.6 (from
the ports tree).

The workaround is used on other BSD too, but honestly, I haven't check
if it was needed or if it works.
opencl: fix potential double-free in module globaltonemap
usermanual: a bit more explanation on module chromatic aberrations
usermanual: first step towards better cross-referencing
usermanual: let version 1.2 shine through
cleanup: remove ugly camel case.
cleanup: removed commented out dead code.
fixed deadlock when loading film rolls from command line.
release script update.

now creating .xz as well as .gz.

Conflicts:
	tools/create_release.sh
Move function calls out of MIN/MAX/CLAMP[S]

... where it makes sense (i.e., not in init code)
usermanual: various fixes and enhancements
Merge branch 'master' of ssh://github.com/darktable-org/darktable