workflows: new action

* Changes the inspire_approval action into a new core_approval
  action that allows curators to accept and mark a record as CORE.

* Adds new JS and templates for the new core_approval action.

* NOTE Makes core_approval action the default action in literature
  submission. Run `inveniomanage upgrader run` to change your existing
  objects.

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
deposit: RT ticket integration

* Adds RT ticket integration in the literature workflow using the rt
  python package (new dependency).

* Changes the literature workflow to create and reply to tickets.

* NOTE you need to setup new configs to use the new integration:
  CFG_BIBCATALOG_SYSTEM_RT_DEFAULT_PWD,
  CFG_BIBCATALOG_SYSTEM_RT_DEFAULT_USER and
  CFG_BIBCATALOG_SYSTEM_RT_URL.

* Adds a new tickets utility module.

* Adds ticket templates for the content of the tickets in the various
  stages of acceptance, rejection etc.

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
deposit: catch FilenameAlreadyExists

* Catches FilenameAlreadyExists when adding fulltext to arXiv
  records.

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
workflows: update core_approval with ticketing

* Updates the core_approval workflow to make use of the new ticketing
  features.

* Adds a rejection modal allowing curator to explain why this record
  was rejected.

* Fixes and improves several things with the core_approval action.

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>