FHS fixes from debian

Applies these debian patches:
- fix-cinnamon-desktop-editor-path
- fix-cinnamon-json-makepot-path
- fix-cinnamon-menu-editor-path
- fix-cinnamon-screensaver-path
- fix-cinnamon-settings-users-path
- fix-settings-path
- install-python-files-in-share.path
- paneljs_icon_search_path
- policy_csu_path

Not moved all source files but changed files/Makefile.in, not tested but
should be working, probably can be improved or changed with better
solution. For now debian move them in debian install file but is not
used on distributions != debian or derivates.
All other changes is already tested.
Upstream developers not want it for not lose the git history.