[MONDRIAN-1254] Fix to EXISTS() that factors implicit default members into the determination of whether a left arg tuple exists in the right arg tuple list.
[MONDRIAN-1254] Modified to check the hierarchies in the tuple rather than dimensions, since multiple hierarchies can be included.
Merge pull request #76 from mkambol/MONDRIAN-1254

[MONDRIAN-1254] Fix to EXISTS() that factors implicit default members in...