Improve support for DOMLSParserFilter:

- if startElement() returned REJECT it was treated like SKIP, and it was changing the current parent node one time too much
- the acceptNode() callback was invoked on text nodes every time some data was added to them, potentially removing it many times
- the nodes rejected by the callback were not recycled, leading to the same memory footprint as they were accepted

git-svn-id: https://svn.apache.org/repos/asf/xerces/c/trunk@811420 13f79535-47bb-0310-9956-ffa450edef68