Modify indentation of function body
Add Roxygen statements for documentation
Remove manually-generated help file for 'surf.dat.generate'
Add Roxygen-generated file for 'surf.dat.generate'
Add export statement to NAMESPACE
Change function name to '2_define_project_levels'
Add function arguments and default values
Define the valid grid projections
Stop function if provided projection not part of valid set
If 'pmap' either of TTM, LCC, or LAZA, use false easting/northing
Validate use of UTM zone
Validate use of UTM hemisphere