Sundry JBossXB changes

[adrian.brock]

I've made a couple of fixes/changes to JBossXB.

1) The SchemaBinding now exposes the namespaces in the document
2) I've improved some error messages. This needs a review.
JBossXB is eating lots errors making the real meaning of the
problem unknown. e.g.

 try
 {
 return getter.get(owner);
 }
 catch(Exception e)
 {
 throw new JBossXBRuntimeException(
 "Failed to get value of the property '" + name + "' defined in " + owner + " from instance " + owner
 );
 }

That's not very interesting, I want to know why it failed.

 throw new JBossXBRuntimeException(
 "Failed to get value of the property '" + name + "' defined in " + owner + " from instance " + owner, e)
 );

3) I made the content handler throw an Exception if it can't find
the schema binding. Previously it pushing null onto stack
which caused an NPE during endElement.
I also added checks to the Stack to trap early when null is pushed
onto the stack.

[aloubyansky]

There are a lot errors in the XB tests that haven't been migrated yet from the JBoss AS testsuite.

[aloubyansky]

It's expected to be 5 failures and 5 errors. Currently, there are 43 errors.

[aloubyansky]

That was mostly due to TypeBinding.getWildcard().
But there are still 6 new errors in PojoServerUnitTestCase.

[aloubyansky]

All fixed.