Update help message for dbfix

Closes #919

See merge request !305

Describe upgrade

See merge request !308

Delete ..db and run_unit_suite module

Closes #942

See merge request !310

Remove docs build directory

Closes #943

See merge request !309

Historic database cherry pick

See merge request es/autosubmit!312

Ready message + some bug fixes from 3.15

See merge request !311

Job_id doesn't depend on retrials anymore when is written

This reverts commit df3aa84f.

folder/index.rst
folder/fig

.. figure:: fig/index.rst X
.. figure:: folder/fig/index.rst working

Describe now is able to show all your experiments ( 4.0 only, the rest of them are not visible )

Meluxia support

See merge request es/autosubmit!306

rerun pydoc !306 (diffs)