legacy: webinterface_handler_local removal

* NOTE removes following warning about direct usage of
  `invenio.webinterface_handler_local:customize_app'. Please, adapt your
  function into package and use configuration option
  EXTENSIONS = ['mypackage.customize_app'] instead.

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
jsonalchemy: support for storage create/drop

* Adds registry for storage engines.

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
base: database create/drop for storage engines

* Adds option for less verbose output for database commands.

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>