addObservationPeriodId() is a new function that adds
the number of observation period that an observation is in.
Add density estimate to
summariseResult()
addCohortName overwrites if there already exists a
cohort_name column #680 and #682.
Correct nan and Inf for missing values #674
Fix #670 #671
addConceptIntersect now includes records with missing end date under the assumption that end date is equal to start date.
add* functions have a new argument called name to
decide if we want a resultant temp table (name = NULL) or
have a permanent table with a certain name. Additional functions are
provided, e.g. addDemographicsQuery, where the result is not
computed.