BibEdit: autocompletion of fields from KBs

• In CFG_BIBEDIT_AUTOCOMPLETE we declare for which fields data will be loaded from which Knowledge Base, in order to help user by autocompleting the value. Also we choose if the data will be loaded when page is loaded or when typing and how will be displayed. (closes #1258) (closes #73)

• addHandler_autocompleteAffiliations is replaced from a generic function that handles the behavior for any given tag.

• Handles both static and dynamic KBs

Reviewed-by: Javier Martin Montull <javier.martin.montull@cern.ch>
Tested-by: Samuele Kaplun <samuele.kaplun@cern.ch>