Add compatibility with Joomla 2.5 in Jms Multisite

• Fix the installation of the components from a slave site to detect the case where the "COM_" is already present in the name of the extension.
  This fix the re-install of Kunena in a slave site.
• Remove call to Joomla APIs to display the expiration date. This will avoid future incompatilities with Joomla.
  Use the native PHP strftime format to display the date instead of the joomla JHTML::_('date', ...) that does not provide any ascending compatibilities.

Jms Multi Sites update

• Improve front-end "billable website" creation to reduce a risk of error when creating a website.
  Technically, we use a POST instead of a GET to reduce risk of "forbidden access" when a .htaccess filter the GET request on some specific patterns.
  The fact to post the info, reduce the risk of rejection.
• Improve the http internal protocol to use the CURL header size when it is present.
  This reduce the risk to receive a wrong reply when the reply does not contain the marker "\n\n" that is the separator between the http header and the http data.

Bundled with Patches definition 1.2.79

• Propagate the T3 framework patch for Joomla 1.5 to Joomla 1.7 and 2.5. So now the T3 patch is applicable to joomla 1.5, 1.7 and 2.5.
• Add Joomla 2.5 sharing definition for:
  - uddeIM