add more details to the server log about teamkills

[barto]

A normal kill message in the logs looks like that:
Kill: 0 3 9: Unknown killed Jane by MOD_SAWEDOFF

Sadly, the "killed" word here is hardcoded in the game, so there is no way to know if Unknown or Jane were in the same team (apart starting to parse logs to find out who was in which team... which i am too lazy to do).

I just would find cool to change the killed word to teamkilled if both players are in the same team.

You can edit this in g_combat.c near line 718