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Version 4.3.0

See merge request west-devel/West!42

Doc improvement

See merge request west-devel/West!40

# Conflicts:
#   IO_kernel/pdep_io.f90
#   Wfreq/solve_gfreq.f90
#   Wfreq/solve_wfreq.f90

Optimize pdep read in Wfreq

See merge request west-devel/West!39

This has proven to greatly reduce I/O time, at the price of slightly
increasing memory usage.

Add distributed band parallelization to Wstat

See merge request west-devel/West!35

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.