Darktable 2.4.1

What's new in this version:

New Features:
- Allow to select the GUI language in the preferences
- Add a filter rule to the collect module to find locally copied images
- Add favourite toggle to darkroom modules' right click popup
- Allow blending/masking in the hot pixels module
- Add keyboard shortcuts to zoom and pan an image in darkroom. Panning uses the arrow keys, zooming defaults to ctrl- and ctrl+. Use alt and ctrl to change the step size of panning.
- Some minor speedups in the grain module
- Handling stdout on Windows: do not redirect stdout for simple command line arguments (--help and --version)
- On Windows, show the location of the log file in the help message
- Enable searching in the more modules list – click into the list to give focus to it, then start typing. The default GTK shortcut ctrl-f doesn't work as it's used for filmstrip already
- Add a debug print when compiling OpenCL kernels

Bug fixes:
- Use the configured overwrite color profile when exporting from Lua – this broke GIMP integration
- Support presets with < in their name
- Fix export to non-existing path with as the path separator on Windows
- Don't insist on the db being locked when it doesn't even exist
- Don't touch the mix slider when resetting the curve in color zones
- Fix a bug in the exposure module that would only allow corrections of up to 10 stops
- Fix custom shortcuts with shift modifier
- Properly ellipsize text in the recently used collections list
- Fix exported galeries with filenames containing a '
- Fix finding mipmaps cache folder in purge_from_cache.sh script
- Fix a crash in the recently used collections list due to a broken config file
- Set the sqlite threading mode to Serialized
- Fix old export presets using OpenEXR
- Fix building with clang on Windows

Changed Dependencies:
- iso-codes version 3.66 or newer is suggested for a nicer list of translations in the preferences
- The Windows installer comes with an updated libexiv2 so TIFF exports should be much faster now