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Now it compiles with PGI 19.10. Two API changes to the previous
version are relevant to West:

* load_file --> load
* print_file --> print

* Update all make.depend files
* Support `make -j`
* Todo: clean up unused module imports

All files were executable.

Updated Westpp. Eliminated import of classes where not needed. K and Q now printed with 5 digits in stdout and json output files in all code.

Upgraded Coulomb kernel. store_sqvc.f90 is now named coulomb.f90; it defines a new module coulomb, containing subroutines to compute coulomb kernel and divergence term. Propagated changes to all code, including Westpp.