mate-control-center-1.6.0: Version bump + remove old ebuilds

Bump to release version 1.6
Remove ebuilds of version 1.5
mate-keyring-1.6.0: Version bump + remove old ebuild

Bump to release version 1.6
Remove ebuilds of version 1.5
mate-character-map-1.6.0: Version bump + remove gconf DEP

Verion bump to released version 1.6
Mate 1.6 migrated to gsettings so remove DEP on gconf
mate-system-monitor-1.6.0: Version bump + misc cleanup

Verion bump to released version 1.6
Depend on the 1.6 versions of MATE.
Remove forgotten DEP gtk-doc (now in eclass)
Bump EAPI to 5
mate-icon-theme-faenza-1.6.0: Version bump

Verion bump to released version 1.6
mate-backgrounds-1.6.0: Version + EAPI bump

Version bump to released version 1.6
Bump EAPI to 5
mate-screensaver-1.6.0: Version bump + remove old version

Version bump to released versin 1.6
Remove old 1.5 ebuilds
mate-doc-utils-1.6.0: Version bump

Version bump to released versin 1.6
mate-file-manager-1.6.0: Version bump
libmatekeyring-1.6.0: Version bump + remove old ebuild

Version bump to released version 1.6
Remove old 1.5 ebuilds
mate-dialogs-1.6.0: Version bump + remove old ebuild

Version bump to released version 1.6
Remove old 1.5 ebuilds
mate-polkit-1.6.0: Version + EAPI bump + remove gtk-doc

Version bump to released version 1.6
Bump EAPI to 5
Remove forgotten gtk-dox DEP
mate-applets-1.6.0: Version + remove old ebuild

Version bump to released version 1.6
Remove old 1.5 ebuilds
mate-settings-daemon-1.6.0: Version + EAPI bump

Version bump to released version 1.6
Bump EAPI to 5
mate-document-viewer-1.6.0: Version bump + small cleanup

Version bump to released version 1.6
Remove commented epatch, commited upstream.
mate-file-archiver-1.6.0: Version + EAPI bump

Version bump to released version 1.6
Bump EAPI to 5
mate-file-manager-open-terminal-1.6.0: Version bump

Version bump to released version 1.6
mate-bluetooth-1.6.0: Version bump

Version bump to released version 1.6
libmateweather-1.6.0: Version bump
mate-sensors-applet-1.6.0: Version bump