BibSched: new web UI for BibSched live view
BibSched: new web UI for BibSched live view

* Adds AJAX interface to view BibSched queue live.  Allows view of all
  information about each task, bibsched mode and MOTD messages.

* Adds new action 'cfgbibsched' to control access to the interface.

* Can be extended later to allow setting up MOTD, selecting queue
  mode, acknowledging errors, etc.

tiborsimko/invenio-access,inveniosoftware/invenio-access,inveniosoftware/invenio-access,tiborsimko/invenio-access