deposit: separation of conferences typeahead

* Generalises extended typeahead to be used for other things not
  only conferences.

* Removes id from cachedQuery. This prevents reset to that string on
  backspace/delete after the page refresh.

Signed-off-by: Kamil Neczaj <kamil.neczaj@cern.ch>
Reviewed-by: Javier Martin Montull <javier.martin.montull@cern.ch>
mixer: index configuration update
base: institutions initial model
deposit: custom autocomplete
deposit: move literature form js init
deposit: new affiliations typeahead

Signed-off-by: Javier Martin Montull <javier.martin.montull@cern.ch>