Ghosts eliminated for opt-in pvp

Faction Soldiers and Halo War participants give each other a flag that
inflicts instant penalties upon logoff. Flag duration 5 minutes. This
eliminates a vast array of abuses that stem from safety complications
surrounding opt-in pvp.

Murderers and Outlaws get the same 5 minute flag for all combat. White
innocents never have instant pens (i.e. always get ghosts). This
counteracts PKs' initiative advantage and gives hunters a chance to
fight back.

This commit includes NO changes to penalties themselves.