[gdome]GdomeNamedNodeMap

[Paolo Casarini <casarini CS UniBO IT>]

I've begun to work on DocumentType Object and now I'm implementing the
NamedNodeMap object. I chose to map this object on the xmlHashTable
because I see that data that have to be returned in a NamedNodeMap are
stored in a xmlHashTable.
Some structure of xmlHashTable are "private" as xmlHashEntry and some
functions too like xmlHashComputeKey. To end my work I need those
structures and function to be in the hash.h and not in the hash.c.
For the moment I've created them locally, but I think it's not the right
way.

Thanx
Paolo