HaXml and HXml toolbox; namespace support

[Simon Marlow]

> > HaXml
> > -----
> > + Already part of the common hierarchical library
> 
> ... and will be distributed as part of the next release of Hugs.

GHC used to ship with HaXml, but we stopped doing this, I believe after
discussing it with you.  I think the reasoning was that you wanted to be
able to distribute new versions of HaXml independently.  Is it really a
good idea to bundle HaXml with Hugs?

Cheers,
	Simon