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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

Restart info was written out in every Davidson iteration. Now this can
be changed by setting the `n_steps_write_restart` keyword. Default is 1,
i.e. same behavior as before.

`IMPLICIT NONE` was added to all program units to catch such errors
at compile time.

This should be reverted when a new version of the nvfortran compiler
is verified to work properly.

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.

This reverts commit 0668ebde.