A lot of stuff!

-replaced target_safezone with target_sone (backwardscompability is in place)
--It now servers for more purposes than just escapepods. Also included in the MSD-System

-Removed list-iteration for safezones.
--They gave me such a hard time and put unneeded limits in place (like one time shots)
--now we loop trough all entities instead and find those with the right criteria and go from there

-For safezones clients are now tagged in the backend (new gclients_t-field)
--only those that aren't taggesd this way will be killed
--Closed FS#30

-First version of shiphealth HUD (FS#8, needs testing)
--There were som modifications made to the full UI as well

-Both Selfdestruct and Shiphealth communication to the client go via command now, the events got removed
-new Version Notation: RPG-X V 2.3 CB 4

Signed-off-by: Harry Young <hendrik.gerritzen@googlemail.com>