Fixed segfault in manager program

Caused by the Program base class attempting to write EOF to programs
which had already exited. This caused a SIGPIPE signal.

The SIGPIPE handler function Game::HandleBrokenPipe then attempted to log the
event by calling Game::theGame->logMessage

However, since the program was exiting, DestroyGame had been called
and Game::theGame was in the process of being deleted.

Fixed by removing the fputc(output, EOF) line in Program::~Program.

It is ironic that this only became an issue since I modified the sample
AI to actually obey the protocol and exit as soon as "QUIT" is recieved...