configurable IDs used for rendering

If the same code is used ot generated a component tree for more than one part of a webpage, the rendered IDs are the same and functionality is broken (javascript needs unique IDs).

An example of when this happens is when as portlet uses JSF for rendering. If the portlet is used more than once on a single page (e.g. an RSS reader) all the IDs are the same.

Thus we need a way to have more configurable (perhaps random) IDs when rendered.