BibClassify: update everywhere

* Add new API function bibclassify_exhaustive_call_text to run
  BibClassify on a string.

* Performs module-wide PEP8 and PEP257 updates.

* Something with get_keywords_output FIXME

* _output_html does no longer replace newlines with <br />.

FIXME: add signed off when OK!
formatter: update something

* FIXME
workflows: Holding Pen change

* FIXME
workflows: improve error messages

* Properly sets error messages upon unexpected errors during
  workflow execution.

* Integrates the error messages into the Holding Pen detailed
  view of an object.

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
workflows: change to panel style
workflows: actions changes and details fixes

Co-authored-by: Guillaume Lastecoueres <PX9e@gmx.fr>