Fix copyright's year
Update copyright dates on synfig-studio po files.
Remove files from extra distribution that no longer exists.
Add named_type.h to sources for tool. If it is not included then normal compilation works but make distcheck for synfig-core fails complaining that the file doesn't exists.
Fix extra distributions for plugging files needed to run make distcheck. Patch by Konstantin Dmitriev (Zelgadis)
Fix the rest of "make distcheck" errors
Missed to mention keyframe enable/disable feature in the NEWS files