Patch-XML v1.2.3

Changes for v1.2.3
Add XML with "_xml='TEEN'" to the selected (via xpath) node.
Evaluate the xpath only one time. xpath with '/..' will no longer fail after deleting the child node.
xpath compatibility: 'contains()' and 'text' support now single and double quotes:
* E[contains(text(), "TEEN")] or E[contains(text(), 'TEEN')]
* E[text="TEEN"] or E[text='TEEN']
* [E="TEEN"] or [E='TEEN']
* For 'match' [E="TEEN"] or [E='TEEN'] must be used, 'contains()' and 'text' are not supported.