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Update Json-Fortran to 8.2.1

See merge request west-devel/West!37

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

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

This feature helps to reduce memory per image. Can be enabled by
specifying `-nb xxx` at the command line (see QE manual).

Add a script to compute module dependencies

See merge request west-devel/West!36

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

Ci update

See merge request west-devel/West!31

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.

* Images
* OpenMP threads

* Use updated Docker images.
* Check numerical results and fail the CI if results don't match.
* For now pw.x is always run with 2 MPI processes. Using more
  processes leads to relatively small noises in the wavefunctions,
  which make a noticeable difference in Wstat, and even a larger
  difference in Wfreq. Why this is happening needs further
  investigation.
* Fix doc build with sphinx 3.5.0+.
  (See https://github.com/sphinx-doc/sphinx/issues/8885)

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