added mandatory client log file

- a client will now write all os console messages to "clientlog.txt"
- at every game start, the log file gets rotated (with five old logs kept)
- commandline parameter "-N" can be used to limit the number of lines
  (after the lines are logged, the file is closed)
Fix switching from spectator to active team in bot modes

Before this fix player could switch from spectate to alive mode,
but he stayed in SPECTATOR team.
Note: 2 mouse clicks are necessary to player's spawn. Second respawnself()
is needed, because spawnplayer() is executed before server will switch
player1 to active team, so he would always spawn in CLA base (in bot
team modes).
Display HUD messages over "dead state" info