proclist, procarg and proctime gtkdoc updates

Added gtkdoc for proclist, procarg and proctime.

Author:    Tristan Hill <stan@saticed.me.uk>

https://bugzilla.gnome.org/show_bug.cgi?id=616082
Merge remote-tracking branch 'origin' into wip/libgtop-ng
Revert "Increased major version"

This reverts commit f9e8ae8dfc090c92c4091ff6e2b78375f258d79f.