XPath: Substantially improved B2 test. 102 assertions now.

Conflicts:
	XPathTestRunner/src/main/java/org/omg/bpmn/miwg/xpathTestRunner/testBase/AbstractXpathTest.java
	XPathTestRunner/src/main/java/org/omg/bpmn/miwg/xpathTestRunner/tests/B_2_0_Test.java