GitLab

- remove deprecated features
- update ABI and API versioning

- updated INSTALL
- change the ELPA vesioning number
- update Changelog and RELEASE_NOTES

Likwid

See merge request !16

Still to do:
- ABI versioning
- API version number
- Release notes
- Changelog
- Issues
- remove deprecated features
- update of API documentation

also introducing --with-likwid parameter to the configure script

Can be used to compile with likwid and to enable the likwid to measure
performance of individual compute steps

with AC_COMPILE_IFELSE in the configure.ac script

adding test which splits communicator at the beginning

See merge request !15

improving forgotten precision macros

See merge request !14

and runs several elpas (still mpi-based) in parallel. Each elpa
"instance" then splits its communicator to row and column communicator,
as it is always done. This is actually often done in FHI-aims and was
previously leading to issues when using OmniPath. Hopefully was solved
by Intel MPI 2019.3. Keeping the test for future reference.

master_pre_stage (even though it did not solve the issue)

Pkus/devel

See merge request !13

Fix omp

See merge request !12