new x:buffer component

[Sylvain Vieujot <sv...@apache.org>]

I'm about to commit a new x:buffer component.

This component allows you to render a part of the page to a buffer, and
then use the buffer later.

One use of this is the dataScroller. If you display a table with
x:dataTable,	you can't have dataScroller BEFORE the table, as it can't
find the not yet rendered table.
So, the solution is that you first render the table to a buffer, then
you render the dataScroller, and then you render the buffer's content.
That way, the dataScroller will appear before the table even though it
was rendered after it.

Note : the generated links within the buffer are only supported with the
MyFaces implementation	because of the lack of standard dummy form
parameters support.

Cheers,

Sylvain.