Small PLIST tweaks:
 * add share/plasma/packages/ because kactivities does not install it
   anymore;
 * add @sample for share/apps/kdm/faces to avoid warnings at deinstall
   time.
Nitpicking in kde4100/Makefile.
Prefer MODKDE4_VERSION over MODKDE_VERSION.
Prefer MODKDE4_VERSION over MODKDE_version for "stable" KDE4 too.
Zap already committed, old and trivial stuff.
Zap last MODKDE_VERSION users.
Zap setting and using of MODKDE_* variables, they only tend to create
problems for ports that want both x11/kde AND x11/kde4 as dependency
(hello from LibreOffice).