search: permanent searchbar, formatter templates

* Adds permanent searchbar

* Adds templates for HEP and HepNames

* Stores search parameters to session

* Adds jinja filters to format hepnames fields

* Adds initial config file

* Adds Bibfield configuration for hepNames

* Adds Bibfield models for Hep and hepNames

Reviewed-by: Javier Martin Montull <javier.martin.montull@cern.ch>
fixtures: adds new db fixtures