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by putting #ifdef WIHT_MPI where it should have been

and supplied to the elpa object by set methods

Add python interface for ELPA

See merge request !8

C interfaces added for:

- elpa_print_settings
- elpa_store_settings
- elpa_load_settings
- elpa_autotune_print_state

Tests are done for:
- elpa_autotune_print_best
- elpa_autotune_print_state
- elpa_print_settings

There are _NO_ tests at the moment for the load/store settings C routine

Also the C interfaces for load/save autotuning are still missing

Return error value of pytest and fix location of wrapper.so to make the
relative imports in python work.

This ensures that the extension that is locally built is always found
first instead of potentially loading already existing modules in the
path.

cython command now works for VPATH builds, test script fixed

Fix automake to include headers for generalized solver

See merge request !7

Resolve conflict in CI tests to include both the python tests and the
distcheck-mpi test.

Some header files are only included when MPI is active (e.g. in the
generalized solver), thus the normal distcheck does not fail if they
are missing in the corresponding automake variables and are not
distributed.

precision_typedefs.h is needed by the generalized methods, but only
included when built with MPI. Thus the normal distcheck does not catch
this.

Also adapt Ci env vars to run the CI tests on freya.

For this, dlopen needs to share symbols globally because MKL internally
uses dynamic loading that doesn't work otherwise.

Add parts to configure.ac and Makefile.am. There is now an additional
flag --enable-python-tests. The tests require the pytest package.

The implementation of the test is a bit hacky because it takes
wrapper.so from .libs. This should probably improbed for better
portability.

This is more efficient because the python loop processes only (number of
blocks)^2 elements.