BibEdit: added search and expandable menu sections
BibEdit: added search and expandable menu sections

* Added search for records other than by record IDs only.
  Enables you search on reportnumber or with a custom
  search syntax on any field. Can be easily extended
  to other fields.

* Menu sections can now be expanded/compressed, to make
  room for more controls (that are coming soon).

tiborsimko/invenio-base,inveniosoftware/invenio-base,inveniosoftware/invenio-base,tiborsimko/invenio-base