problem with internal ui: namespace

Any namespace that is used in an XML file *has* to be declared in that 
XML. Currently, core defines the ui: namespace internally, which means 
that it is functional to do:
<ibex>
<ui:box/>
</ibex>

But this is illegal XML, since ui: wasn't specified with a namespace 
declaration.
If you attempt to declare a namespace declaration for ui, then it tries 
to override the internal ui mapping, and therefore doesn't work.

I would suggest that instead of doing an internal namespace mapping, 
that we just have a virtual pathtowidget mapping (ui.box, for example), 
that *can* be defined with a namespace declaration in template files, 
but doesn't have to be.

-Tupshin