Merge pull request #10 from tgf/evergreen

Key lookup, CoalesceEmpty, Description, tests
[MONDRIAN-1572] fixed an issue with more than two bridge dimensions.
Merge branch 'm2m' into evergreen
[MONDRIAN-1912] initial prototype of Calculated Cells feature for early
feedback.
[MONDRIAN-1912] initial prototype of Calculated Cells feature for early
feedback.
use 0/1 when FetchChildrenCardinality=false