Modifications for Brevard's data conversion (2nd after many months of Enrich use).  Most significant addition is the Incoming and Existing StartDates.
Changes for Brevard DC
Defaykt OID if null
Limit to most recent existing involvement.
Use left join and where clause to limit insert to new records only.
Merge branch 'master' of https://github.com/petergindhart/excent-to-enrich

Conflicts:
	DbScripts/LEGACYSPED/Objects/0003-SetupETL.sql