Fixed /tp command

Added correct return value and swapped targetid/playerid for messages.
Updated detfield

Increased max name length.

Added underscores to valid names. Made any name matching
DETFIELD_TABLE_MAIN return 0 since detfields have a table named after
them.
Fixed max uptime bug in server settings

Default value changed to 5 instead of 3600 * 5.

Fixed default value for max-uptime so it's in the 'server' key-group
instead of 'player'.