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by allreducing the measured time and using average over ranks insted

to avoid stalling between storing and loading parameters

checking that the loaded values equal to the stored values

and removing one extra check

the error handling has to be thought of properly in some of the uses
of check_elpa_get/set (e.g. those outside the elpa_setup function)

mpi_comm_parent is allways requred (it was not required before, but
actually the code internals expected it to be supplied, at least for
ELPA 2 calculation OR whenever GPU was used)

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