Add key accel to import folders

I added a default of ctrl-shift-i, however that doesn't work on my
system. Probably there is some global window manager shortcut in the
way, so YMMV.
Correctly specify the version of presets

When bumping the version of colorzones the presets we ship were
(half) forgotten.
wb_presets: update to ufraw-cvs
(cherry picked from commit 1ea291c2b59ffdeea370154dd4c9d99c191de134)
Merge branch 'master' of ssh://github.com/darktable-org/darktable
Add single module mode config

This toggles the meaning of shift-clicking, separately configurable for
lighttable & darkroom mode.
cmake: build with libpng 1.5 (from OpenBSD ports)
(cherry picked from commit 97e7ab882ec278e18797b4992e9664faef8f8927)
pthreads: disable the default PTHREAD_MUTEX_STRICT_NP behaviour for OpenBSD
(cherry picked from commit 46be9a13a0bb54aeb28f01fb0d718247aba773d1)
Make life easier for translators
[l10n] Swedish update: 11 fuzzies and 4 new strings
Update french translation.
Review and update exsiting Thai language translation.