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There was again a case where stack-variables were loaded with
instructions that needed properly aligned memory. This only surfaced
with the Intel C compiler, where the stack layout evidently was
sufficiently different to trigger this.

This was also the case for SSE kernels

Previously we checked ortonormality of eigenvectors by comparing
the matrix S^T * S to identity matrix. The new feature is also
checking just the diagonal of the matrix S^T * S. By that we get
the information, how far are the eigenvectors from having length 1.
If it turns out to be important, we could try to normalize them
at the end of elpa, which is simple (in contrast with enforcing
better orthogonality).

This stupid bug was there since commit ae45bbb3

of _GEMM and P_GEMM calls

PGI has problems with elpa_int_value_to_string() where we return a
variable-length string pointer. A workaround for now is to copy the string into
a non-pointer variable of the same length.

This closes issue #55

This prevented compilation with Intel 2018 Beta and solves issue #54. It
turns out you can only override type-bound procedures that are
accessible in the module where you override them, thus they have to be
private. A "deferred, private" type bound procedure could only be
overriden from the same module (or a submodule thereof).

Many thanks to Igor Vorobtsov from Intel for clarifying this.

Pavel noted that some header files were missing from the distribution.
Also, I moved the private generated header files to src/ in order to
more clearly separate them.

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).