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Allow user to specify how often wstat writes its restart info

See merge request west-devel/West!32

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.

Misc fixes

See merge request west-devel/West!30

Build instructions

See merge request west-devel/West!29

Forpy fixes

See merge request west-devel/West!28

* Optional arguments in apply_operator were made non-optional, as
  optional arguments without explicit interface are disallowed. Those
  optional arguments were almost always supplied anyway when calling
  apply_operator. Without this fix, code could not work properly with
  pgfortran and nvfortran.

* Argument list was incorrect when calling get_brak_hyper_parallel.
  Again, this works with some compilers because of the memory layout
  but it doesn't work with pgfortran.

Memory was computed as `dim1 * dim2 * ... / MB`. In a large calculation
`dim1 * dim2 * ...` can easily overflow. To avoid overflow, now we do
`1.0 / MB * dim1 * dim2 * ...`.

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

All files were executable.

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

* By default Forpy is no longer initialized with Numpy support, as the
  Numpy features are currently not used.
* Right after initialization, test whether import module works. If not,
  print an error message and stop. Before this commit, the code may
  segfaults without giving any error message.

* Theta
* Cori
* Midway3
* macOS 11

Bugfix

See merge request west-devel/West!27

Makefile improv

See merge request west-devel/West!25

Pysetup

See merge request west-devel/West!24