switched to the new version of src/shared/utm_geo.f90 in order to have support for the Southern hemisphere. Also switched to the WGS84 ellipsoid instead of Clarke 1866. Updated the users manual accordingly.
changed "zone" from double precision to integer (the code worked fine anyway because the value was then used in a double-precision expression)
update instructions for default example based on file name changes
added a warning about versions dot zero of a compiler