Cleanup meta/kde4 a bit:
  * get rid of unneeded ${V};
  * remove superflows PKGNAME definition;
  * move MODULES block down.
Add recently ported K3b and Kdenlive to -extras, and move kgpg and
base-artwork from there to -main instead.
Remove py-hg-git, newer version is in CVS already.
okayed by viq.