Added (again?) makeLowQuarterDate() and makeUpperQuarterDate(). Declared dateInQuarter() deterministic.
Added (again?) makeLowQuarterDate() and makeUpperQuarterDate(). Declared dateInQuarter() deterministic.

paepcke/json_to_relation,paepcke/json_to_relation,paepcke/json_to_relation,paepcke/json_to_relation