Further tweaks to MathAssess examples
Minor tweak to object dumping for XmlParseResult
Further improvements to MA examples
Moved 'Exit' button for standalone items

It now sits with the other main buttons, leaving
source & result on the 2nd row. I plan for this 2nd row
to disappear completely once we get the new author view
ready.
Commented out text() template in XSLT serializer

This template is ancient and does odd (wrong) thins to
text after inline MathML elements. I think this dates from
IE6/MathPlayer, so I need to work out whether this is still
required and, if it is, fix it.
Minor reorg of MA examples:

* MAB01 is temporarily removed from the sample set
* MAA01 and MAC02 moved together as they're very similar