Minor uptade in French usermanual
Update French usermanual
Merge branch 'master' of https://github.com/darktable-org/darktable
Update French usermanual
Merge branch 'master' of https://github.com/darktable-org/darktable
Proofreading of the French user manual (the first 50 pages)
Merge branch 'master' of https://github.com/darktable-org/darktable
Proofreading of the entire French user manual
Merge branch 'master' of https://github.com/darktable-org/darktable
Merge branch 'master' of https://github.com/darktable-org/darktable
graduated density: fix gradient mouse move when zoomed in.
rawspeed: Panasonic GF5 aspect ratio modes

samples kindly provided by Pavel Nakonechny
Merge pull request #777 from michleb/master

Proofreading of the entire French usermanual
fix bug #9742 (zoom combobox has no immediate effect on OS X)
Switch to GTK3 in cmake
Import osm-gps-map-1.0.2

Previous versions does not compile with GTK3
Cleanup CMake system now that GTK uses pkg-config
Respect REQUIRED when looking for GTK3 components
Load darktable.css instead of dakrtable.gtkrc

This is just a sample .css file with a dark background color to see if
loading worked.
Temporarily enable deprecated GTK/GDK symbols