Remode numpydoc that can now be installed from pypi
Add buttom to hides the prompts nd output in the html documentation.
Automatic style corrections courtesy of autopep8.
Merge pull request #302 from francisco-dlp/BUG_FIX_dmreader

BUG_FIX: the dmreader sometimes fails to load single spectrum.
Merge branch 'master' into DOC_foldable_code