Correctly sample displacements in update_auto_stations()
Correctly sample displacements in update_auto_stations()

When starting the automatic search for dispalcement magnitude in
update_auto_stations(), starting from the fault source can result
in smaller displacements becoming larger before decreasing. This
can lead to premature exit from the subroutine without identifying
the full deformation footprint. Instead, sample from farthest
points back towards fault in all directions.

mherman09/Hdef,mherman09/Hdef,mherman09/Hdef