Move the content of the loop over scales in a separate function, so it can be called with fresh arguments every time to check parallelism and dependencies.

- turn C4 from a structure to a class (to do the above), move its initialisation to its constructor
- eliminate "allocate_vectors()", redundant and including a (wrong) double allocation

Always refer to np_int definition

See merge request giacomo.mulas/np_tmcode!25

Link with LAPACKe

See merge request giacomo.mulas/np_tmcode!24

Merge branch 'link_with_lapacke' of https://www.ict.inaf.it/gitlab/giacomo.mulas/np_tmcode into link_with_lapacke
Fix compilation flags

Merge branch 'link_with_lapacke' of https://www.ict.inaf.it/gitlab/giacomo.mulas/np_tmcode into link_with_lapacke
Update the container configurations.

Merge remote-tracking branch 'refs/remotes/origin/link_with_lapacke' into link_with_lapacke