* Added a client check to revheads and heads, when checking for victory conditions. Having a clientless revhead or head will count them as dead.

* Made sure the check_rev_victory() checked only for mutiny objectives, otherwise anymore custom objectives will cause the game to never end.
Merge pull request #1038 from Giacomand/rev_client_check

Added a client check to revheads and heads, when checking for victory ...