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>
WebSearch: change me

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>