What does Cleanup in Tas-G do.  I hit it by mistake and am not sure what it did.

Cleanup is a one time utility that cleans up the data in the menus..  
 
It only needs to run once, and if you have already run it the button no longer appears on the screen.  The original TAS-G program was not removing menu lines from the data fields and if you ever took something off the menu then put it back it was doubling up the lines.