Makes lwgeom_tcpa return -2 if inputs do not share any point in time.
Includes documentation and testcases tweaks.
git-svn-id: http://svn.osgeo.org/postgis/trunk@13630 b70326c6-7e19-0410-871a-916f4a2858ee
Adds lwgeom_is_trajectory and lwline_is_trajectory to liblwgeom.
Includes unit and regress test.
Includes documentation, starting a new "Temporal support" section
in which ST_ClosestPointOfApproach is also moved
git-svn-id: http://svn.osgeo.org/postgis/trunk@13570 b70326c6-7e19-0410-871a-916f4a2858ee