Enhancements

Added ability to filter cost util reports by periods (#532) @agackovka
Utilization - Optional roll-ups for concept_ancestor (#544, OHDSI/Atlas#836) @gowthamrao, @pavgra

Fixes

Fixed heracles heel 'monthly change > 100%' analysis for Netezza (84dfb26) @pavgra
Switched date formatting to classic format without comma (change reason: to properly work in FF) (eb268ce) @pavgra
Fixes for Achilles and Heracles reports in Impala (#539) @pavgra
Calculate only summary for Cost & Util when periods are not passed (9afa2f4) @pavgra
Fixed retrieval of generated cohort members (62a8fc0) @pavgra
Fixed related concepts retrieval in Impala (#543) @pavgra
Removed dummy "No matching concept" option in filters for Cost & Util reports (#556) @pavgra