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The thread_width was not set correctly

a preprocessor flag was missing

This closes issue #23

A small missing '$' caused a lot of mischief. Augmented also the tests
to detect something like this in the future

Now they just cluttered the main build directory, put them also in
private_modules/. This of course assumes that no two test programs
define modules with the same name.

Also, this necessitates that the shared sources are also only compiled
once, thus I put them into an internal libtool convenience library and
link all test programs with it.

Remove all references to private functions and symbols from the public
Fortran modules. Install also only the public modules

This allows to install several versions of the library in the same
directory

If compiled with MPI, the necessary "mpiexec -n 2" was not written
in the check scripts. This commit is based on a patch provided by
Michael Banck from debian.org

In principle we don't want any stop statements in the library, but for now its
better to abort with an error than to abort successfully