general: new configuration var CFG_DEVEL_TOOLS

* Adds new configuration variable CFG_DEVEL_TOOLS to enable
  or disable Invenio development tools suck as Flask Debug
  Toolbar, SQL logging, Werkzeug Debugger and more (closes #1325).

Reviewed-by: Jiri Kuncar <jiri.kuncar@cern.ch>
WebSearch: wash_search_urlargd relocation

* Moves function wash_search_urlargd to websearch_utils.py.

Co-authored-by: Jiri Kuncar <jiri.kuncar@cern.ch>
travis: initial configuration release