Specify zones with hemisphere instead of letter, fix spec and coords in 32V 

 * Fix spec test data using Clarke 1866 ellipsoid, it wasn't passing since the radius was changed in 165c72d5ec4e1345d5a71c151ac5214cab26a04f
 * Fix converting LatLon coordinates in 32V zone to UTM (was returning negative easting)
 * Add ability to specify zones with + or - instead of a letter, for northern (+) and southern (-) hemisphere