Store location.time in seconds, not milliseconds

Resolves #7
New seed database, with changes to favorite table

 - Declare id column as INTEGER PRIMARY KEY, resolves #6
 - Add last_location column to track algorithm's progress, resolves #8
 - Also, check in the script used to create these tables
Script to load KML tracks into database
WIP algorithm prototype scripts
WIP delete new favorite if there's a better merge, etc.