#52 h2ded, coop issues

[Ozkan Sezer]

h2ded (hexen2 dedicated server): Some coop mode issues reported by
Jakub Majewski on the forums:
http://sourceforge.net/p/uhexen2/discussion/425207/thread/5afe467f/

• Skull wizards may become non-solid and invincible after they blink
  away and come back.

• Dark Pharaoh's staff would disappear after pushing the switch that
  lowers it.

• Loading saves may often result in bugs.

• The issues don't seem to happen with "h2 -dedicated"

To be analyzed.

[Ozkan Sezer]

Related: bug #43 (https://sourceforge.net/p/uhexen2/bugs/43/)