implemented connect flood blocking (100% effective on connect floods with an interval of 5 seconds or less between connects from the same IP address, and limits connect floods slower than that to occupying 2 slots at once due to a 10 second timeout)
cleaned up connect packet handling code to be more readable and consistent
reenabled rejoin code (allowing players to resume the game if their client crashes crashes but comes back with the same port number - rather rare unless cl_port is used, but could help people who do use cl_port)
git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@6609
d7cf8633-e32d-0410-b094-
e92efae38249