Aggregator_Dimension: fix key_code; Aggregator: aggregate(): set this.groups, provide get(), add(): call this.aggregate()
Aggregator_Measures.build_reduce_groups(): optimize unrolled while for single measure
Aggregator_Measures.build_reduce_groups(): accept undefined or null values
Aggregator tests: fix undefined measures to 0, test 79 successful
Merge branch 'master' of github.com:ConnectedSets/ConnectedSets