TRUNK-4105: Add index for code column on the concept_reference_term table
Added previous_order, action to orders, also converted drug_order.complex to drug_order.dosing_type - TRUNK-4123, 4124, 4125
Follow up to  - TRUNK-4123, TRUNK-4124, TRUNK-4125

Fixed annotation description in unit test
Back porting module life cycle tests - TRUNK-4134
Follow up to fix failing changeset - TRUNK-4125
Back porting to 1.10.x: N+1 select issue with Obs and ObsGroup -
TRUNK-4141
Follow up to split up the changeset that modifies the datatype and updates values of the drug_order.complex column - TRUNK-4125