Correct MapProjection.orthodromicDistance() over small distances.  (GEOT-4433)
Loosen default projection assertion tolerance to reflect reality.  Add
a special case for TransvereMercator near the latitude of origin.
Merge pull request #173 from warmerdam/35dc4d8e5ebec01cd0307a6f54527ecae5bf8d4d

GEOT-4433 - Fix orthodromicDistance().