Joomla 1.7 compatibility.

• The access to the MySQL connection is become protected field in joomla 1.6 and 1.7.
  Therefore the MySQL connection can not more accessed directly.
  Now we use the "connected()" function to verify the DB connection.
• Fix the re-installation of a component in a slave site.
  In Joomla 1.7, the install of a component in a slave site didn't created the DB tables and the menu.
  With the fix, the "fresh" install is called from a slave site and no more the joomla "update" that don't create the mysql tables and admin menu when they are not present.

Improve Jms Multi Sites

• Add the possible to create shared tables with specific filtering.
  This new feature is used in the Partial User Sharing and introduced the possibility to filter the content of some extension.
• Remove a potential warning that could be displayed when SEF is enabled (front-end router) and that PHP is configured to display the warnings.
• Remove a potential warning message inside the JMS tool during the installation of a component.

Bundled with Patch definition 1.2.71

• Add JMS Tools (install) definitions for :
  - Widgetkit