Sync Mk with ports
Prune 13 obsolete ports

FreeBSD Ports maintainers have already deleted the following:
  deskutils/blogtk
  devel/ORBit
  devel/pure-stldict
  devel/pure-stlvec
  mail/squirrelmail-postfixadmin-plugin
  net-im/qutim
  net-p2p/libtorrent-rasterbar-16
  net-p2p/libtorrent-rasterbar-16-python
  textproc/docproj-nojadetex
  textproc/gtkdiff
  textproc/p5-Text-Emoticon-MSN
  textproc/p5-XML-Hadler-HTMLWriter
  x11/gnome-libs