Version 0.30 beta: Implemented a user configuration file to store last-read...

Version 0.30 beta: Implemented a user configuration file to store last-read message numbers separately from Synchronet's messagebase so that SlyVote won't mess with users' actual last-read message numbers.   Also, updated so that when changing to another area, if the top item index is on the last page of the menu, then set the top item index to the first item on the last page.