Usage of default variables for psfandgridconv in geo2grid and grid2geo #177

The functions geo2grid and grid2geo both call the function psfandgridconv, but don't pass this function call the Ellipsoid or Projection variables. This means that all results from geo2grid and grid2geo will return Point Scale Factors and Grid Convergence values using GRS80 Ellipsoid and UTM Projection parameters regardless of what these are set to when calling these functions.