[MONDRIAN-1061] - junit tests added

junit tests added to reproduce java.lang.StackOverflowError

	modified:   testsrc/main/mondrian/rolap/VirtualCubeTest.java
[MONDRIAN-1061] - java.lang.StackOverflowError resulting from recursive calculated member usage within virtual cube

fix added to avoid recursion loop

	modified:   src/main/mondrian/rolap/RolapCube.java
Merge pull request #351 from prakapenka/MONDRIAN-1061

MONDRIAN-1061 - java.lang.StackOverflowError resulting from recursive calculated member usage within virtual cube