deposit: minor edit action bar fix

Signed-off-by: Lars Holm Nielsen <lars.holm.nielsen@cern.ch>
communities: ckeditor toolbar changes

* Adds Mathjax support to CKEditor and removes certain other buttons.

Signed-off-by: Lars Holm Nielsen <lars.holm.nielsen@cern.ch>
base: missing MathJax config variable

* Adds missing config variable CFG_MATHJAX_RENDERS_MATHML to default
  configuration.

Signed-off-by: Lars Holm Nielsen <lars.holm.nielsen@cern.ch>
formatter: master merge fix

* Reapplies 71fe41cacf6bdb124433aca1a40acafdeaf361af which got
  overwritten by the large master to next merge.

Signed-off-by: Lars Holm Nielsen <lars.holm.nielsen@cern.ch>
formatter: format record extra context fix

* Fixes issue with passing extra context variables to format record
  introduced during merging new changes from master.

Signed-off-by: Lars Holm Nielsen <lars.holm.nielsen@cern.ch>
bibupload: support for strings in utils

* Adds support for strings instead of only recstruct in
  bibupload_record helper function.

Signed-off-by: Lars Holm Nielsen <lars.holm.nielsen@cern.ch>
knowledge: PEP8 and PEP257 improvements

* Removes `__init__` methods.  (PR #2184)

Co-authored-by: Javier Martin Montull <javier.martin.montull@cern.ch>
Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
linkbacks: fix tab visibility if excluded

* Adds module to excluded packages and disables tab in detailed record
  view.  (closes #1707)

* NOTE Adds deprecation warning for linkbacks module.

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>