Update the replay maintenance script to allow for rolling replay maintenance along with cleanup of the two associated db tables (replay access and games).  This updated script will now allow players to see the past X days (8 by default) of replays rather than loosing all replays from the point in the the script gets run.

Updated description in script to clarify things.

Added the ability to specify custom database name.
Added the ability to specify custom table prefix.
Created sub folders for operating systems.