ajax.php, the _directions_via_trails() function no longer requires the "prefer" param, since it is deprecated.
This requirement was affecting the Measure tool, which never specified a preference for shorter/faster. Measure tool tested and confirmed working.

Trivial change to desktop.js to add the Markers to the Map at the same time as setting their latlng (one less line of code) and added a comment about the location of the markers.