[2/4] msxml3: Properly update xmldoc refcounts on insertBefore()

[Nikolay Sivov]

insertBefore() is able to work on nodes from different documents, so on 
adding child or sibling it's possible that libxml2 switches doc pointer 
for a node, we need to update refcounts to cover that case.

Added test will show this problem under valgrind - one leak and one 
invalid read for already freed document.

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