Dropping orphan concept and source concept functions, as these are now implemented much better in the CohortDiagnostics packages.
Replacing ff with Andromeda for storage of large data objects.
Renamed synthesizePositiveControls to synthesizeReferenceSetPositiveControls, injectSignals to synthesizePositiveControls, and changed addExposureDaysToEnd to endAnchor.
Dropping individual metric function. The computeMetrics function now computes the standard set of metrics.
Added checkCohortSourceCodes and findOrphanSourceCodes functions.