GitLab

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

The legacy API is has been (internally) ported to use the new interface.
The intent is that users of the legacy API do not have to change their
codes.

Next step is to completely adapt the .gitlab-ci.yml file

Still missing is the compatibility layer, currently it only compiles
when configure is called with

  --disable-legacy

Also, a more general solution to parameter passing via environment
variables would be nice.

It could happen that ELPA stopped with an error but an exit code "0"
was given, i.e. one could assume everything was fine when it was not!
Now each Fortran "stop" was replaced with "stop 1" to prevent this

 This commit is triggered by issue #38