Working on release of 0.3.2 to main

[jr3cermak]

• Resolves #15 with use of extending grids prior to using regridTopo() and then clipping the grid back to original size.
• Resolves #16 with fixes to stereographic grid generation
• Moved requirements around for RTD so it continues to create documentation; there is no need for RTD to have a fully functional software stack; just enough to parse the python modules
• Updates to key netcdf files now update instead of clobber the "history" attribute
• Implement ice9 algorithm
• Implement subsetGrid()
• Rework API arguments used by computeBathymetricRoughness()
• BUG: fix latitude range for grid center. Latitude can now be -90 to +90 instead of 0 to 90.