client: do a silent return in CMD_RemoveCommandSafe when mods try to
remove obsolete 'button4' cmds
cgame: fix for hovering over command map spawn icons fixes #202,
cg_automapzoom introduced (merged from NQ)
server: report entitynumber for SV_SetBrushModel errors - patch by 
t4im/Unvanquished
client: fix potential buffer overflow for openal
sfxHandle_t registrations pach by t4im/Unvanquished, check for empty
filenames