Minor changes. Moved some files around.

Renamed StatFileLine.java to PlayerRecord.java and moved it to
irccasino.cardgame. Added a getComparator static method to PlayerRecord to
allow sorting based on any stat. Moved help files back to irccasino from
subpackages. Updated showTopPlayers() and showPlayerRank in TexasTourney
to use the new PlayerRecord.getComparator().