[MONDRIAN-1180] existing: only constrain referenced hierarchies, native as crossjoinarg
[MONDRIAN-1721] preserve context in NonEmpty()
[MONDRIAN-1180] transient tests for existing, remove filter check
[MONDRIAN-1180] oops: missing from commit 33dedc4
[MONDRIAN-1180] existing native: use all hierarchies from same dimension
[MONDRIAN-1180] existing non-native: filter results with diff hierarchies of same dimension
Merge pull request #43 from tgf/existingDim

Existing: constrain by hierarchies of the same dimension