* teamupload.php: check for duplicates
* print the teams that were parsed
* fixed invalid return value in HTTP_GetURLInternal
* some updates to the php scripts for the multiplayer team sharing
* added a return value to HTTP_GetURL
* print an error in GAME_ListTeams_f if querying the team list failed
* fixed download url for the teams and HTTP_GetURLInternal url check
* fixed getFreeId (not yet safe for multiple uploads at once)
* fixed team download id