#8 Make the portlet 100% compliant in Servlet mode

[Pierre Le Roux]

I can be useful to test a portlet without being in a portal.
So portlet applications have to be able to be launched in a servlet container such as Tomcat.

Actions are :
* Request are now RenderRequest but it has to be also possible to use HttpServletRequest
* Users have to be mocked when we are in Servlet mode
* Edit View and Help mode have to be displayed with a tabs screen instead of the 3 actual buttons.