GitLab

- add skylake tests
- deactivate minsky runner for the time being

In case of GPU build it is NOT sufficient to loop over all kernels:

For the GPU kernels one must ALSO set that GPUs should be used

Introducing python script plot.py containing several classes used to
plot matrices stored in block-cyclic distribution as a 1 global matrix.
Docstrings in plot.py should explain the ussage. There are also two
use cases included, both with commented scripts (using classes from
plot.py) and a screenshot. One of the use cases contains also tarball
with data.

Apart from that, a VERY simple module matrix_plot.F90 was created. It
is really simplistic, a more systematic approach towards loging should
be designed. At the moment, matrix output has to be triggered explicitly
in the code by calling a macro SAVE_MATR(event_description, iteration).

- Did not properly handle case when $HOST is not set
- String comparison with "[" is done with a single "="