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Anything if it makes Andreas happy :)

This stupid bug was there since commit ae45bbb3

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.

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).

whether or not a step is actually computed is decided with logicals
(default all 3 steps are computed). This makes the implementation
of "solve_tridi" and "eigenvalues_only" a bit cleaner in the future

These can be used internally by

  call self%set_private(name, value)

   or

  call self%get_private(name, value)

but are not valid for the self%set()/get() routines, i.e. are not
visible to users of ELPA.

The public "solve" method has been renamed "eigenvectors" since it
computes the eigenvalues and (at least parts of) the eigenvectors

Another routine "eigenvalues" will just compute the eigenvalues

DATATTYPE instead of DATATYPE

This prevented builing for SUSE Leap_42.2 but actually this should
always have failed !

This is a bit cumbersome, as it involves yet another abstract
intermediate type, but necessary due to language limitations.

By mistake a procedure has been named
"invert_tridiagonal" but the correct name should be
"invert_triangular"