Ordering check component implementation for classes with next and previous attributes

[ASL-rmarshall]

Ordering Check Component	Activity	EligibilityCriteria	Encounter	StudyEpoch
The id value specified in any previous or next for a StudyEpoch must be valid.	Define rule: #89 Create rule: #133 Rule ID: DDF00028	Define rule: #79 Create rule: #135 Rule ID: DDF00030	Define rule: #89 Create rule: #134 Rule ID: DDF00029	Define rule: #48 Create rule: #73 Rule ID: DDF00023
Any id value may be referenced no more than once as a previous instance and no more than once as a next instance.	Define rule: #89 Create rule: #136 Rule ID: DDF00027	Define rule: #89 Create rule: #136 Rule ID: DDF00027	Define rule: #89 Create rule: #136 Rule ID: DDF00027	Define rule: #89 Create rule: #136 Rule ID: DDF00027
Within any StudyDesign there must be exactly one StudyEpoch for which previous is not specified (the first epoch) and exactly one StudyEpoch for which next is not specified (the last epoch)	Define rule: #89 Create rule: #127 Rule ID:	Define rule: #79 Create rule: #127 Rule ID:	Define rule: #89 Create rule: #127 Rule ID:	Define rule: #48 Create rule: #117 Rule ID:
The values of next and previous must be complementary	Define rule: #89 Create rule: #127 Rule ID:	Define rule: #79 Create rule: #127 Rule ID:	Define rule: #89 Create rule: #127 Rule ID:	Define rule: #48 Create rule: #117 Rule ID: