We cannot just remove data from common.inc.php
The class expect and try to use it throwing errors/warning every
time the application load.

Needed by the application and we must make sure it is there.
Anyone that does not like this can locally override this settings.
One less settings that needs to live in settings.inc.php.

Application default settings cannot have dependencies
on the local user provided settings.

- Require the application default settings. Loadspkr needs it
and have to stop if not present and not simply throw a
notification.
- Introduce a constant that points to where Loadspkr have been installed. Allows
us to later move the common.inc.php without it breaks the bootstrap.

This decision was made based on the lack of CORS-enabled SPARQL endpoints, which difficults the use of client-base queries.

Changed static location in common.inc.php

Added sparql filter module that allow users to filter by a random query rather than a type to select a model/view for a URI

TODO: Apply Haanga to it