Add "Hide old points" button, add scripting tools

- Events now allow hiding all trackers from assigned
   maps until new positions of trackers are received.
   Useful for large comps when not-interesting points
   from yesterday take screen.

- Scripts added to facilitate making standard SQL
   scripts for creating database. Rather than select
   tons of settings in "Script Database" wizard, just
   run added .cmd file to get flytrace-related DDL in
   standard way.