[Xsltforms-support] Workarounds for namespace axis pb in FireFox

[COUTHURES A. <ala...@ag...>]

Hello,

Because the namespace axis doesn't seem to be supported in FireFox soon, 
I have just added some extra Javascript instructions to declare 
namespaces discovered in external instances. It seems to work well but 
it's definitely not perfect: if prefixes are not exactly the same in all 
the documents, it will fail and might cause funny behaviour.

Concerning namespaces associated with schemas, I also added a workaround 
to look at defined types. Types with identical names in different 
schemas might not be correctly interpreted...

The dummy attribute added in the XForms document is still the ultimate 
workaround... but it might now be useless in most of the situations.

Thank you for your feedbacks about these workarounds!

-Alain