Add user queries

It's an intermediary step to remove the favorite button.
I add a button to store the current query as a favorite query. It redirects automatically to the configuration page where it is possible to name and remove user queries.
To make the queries more straigtforward, I removed the default behavior when searching for a string. This way, when we search for a string, the filter is not defaulted to all articles.
Fix tabs
fix tabs
fix tabs
Fix array values
Merge branch 'user-queries' of https://github.com/aledeg/FreshRSS into aledeg-user-queries

Conflicts:
	app/layout/nav_menu.phtml
Improve system of queries

- Coding style
- More checks server side
- Default query name is "Query n°X"
- List of queries is moved into nav_menu, in a dropdown
- Better system to remove fields in JS (to a.remove elements, give an
  attibute data-remove="id_to_remove")
- Fix a bug in lib/Mine/Request.php (htmlspecialchars_utf8 can be applied on
  arrays now)
- Few theme improvements
- Add an element .no-mobile to apply to elements which should not appear on
  mobiles

See https://github.com/marienfressinaud/FreshRSS/pull/498
Merge branch 'aledeg-user-queries' into dev