added debug_evaluations section to store the result of calculating preconditions and data criteria separate from the log
Merge branch 'develop' of github.com:pophealth/hqmf2js into develop
fixed library function tests to add precondition ids to allTrue, etc.
updated debug evaluations to be called rationale
Initial support for TIMEDIFF observation CV measures
Add OBSERV to emitted functions
Fix bug in code generator whereby an empty return could be emitted for the OBSERV population criteria
fixed logging code to not trample on new specificContext that's passed into OBSERV calculation.
added custom function for observ calculation for ADE
added filtering for outliers for ADE custom calculations based on measure definition
updated codes_to_json for hds valuesets
merged value set swtich over branch
fixed against hds update
updated MP end date
updated hds and patient-api
updated fixture to change codeSystem to code_system
updated versions for release