Added temporal data to track data. (closes #9)

Added temporal data to track data.  (closes #9)

Generally speaking, there is a new vocabulary in use - tracks now refer
exclusively to "where you have been".  Routes refer to "where you would like to
go", and both are considered subclasses of "Path".  Both Tracks and Routes have
positional data, but Tracks also have temporal data, and Routes also have
waypoint data.

git-svn-id: svn+ssh://garage/var/lib/gforge/svnroot/maemo-mapper/trunk@24 6c538b50-5814-0410-93ad-8bdf4c0149d1