Changes:
- Add option preserve for gamma adjustment methods (randr, vidmode,
quartz, w32gdi) to apply redness on top of current gamma
correction.
- Fix#158: Add redshift.desktop file to resolve an issue where
Geoclue2 would not allow redshift to obtain the current location.
- Fix#263: Make sure that the child process is terminated when
redshift-gtk exits.
- Fix#284: A sample configuation file has been added to the
distribution tarball.
- Fix warning message in redshift-gtk that is some cases caused
redshift-gtk to fail (#271)
- Fix#174: Use nanosleep() for sleeping to avoid high CPU load on
platforms (NetBSD, ...) with limitations in usleep()
- Various updates to man page and translations.