use netCDF env var functions, change 'wrfbuildtype' option to 'buildtype', add required custom make_module_req_guess and make_module_extra function definitions

add functions for setting netCDF environment variables, and generating module setenv commands for them

get rid of patch file that's not required, simply disabling usempi in toolkit options should suffice (if ifort is used as compiler, linker flags are set correctly)

significantly clean up determining correct build type, by used named group Q&A feature to construct answer based on matched question

correctly select WRF build type based on new toolkit_comp_family function in tools/toolkit.py; bring get_openmp_flags into Toolkit class so it can use toolkit_comp_family  as well

adjust easyblock and add patch file to make WRF build procedure support netCDF-4.2 with seperate netCDF-Fortran libs

fix module name and class name for netCDF-Fortran, and make sure netcdf_fortran module will be found