KRACOEUS-7022 fixing several more mappings, some cleanup

In the pull request I'm fixing several things:

* Removing mapping for DocumentHeader.  This should not be mapped as it is a Rice Bo
* fixing S2sOpportunity ownership
* fixing ProposalDevelopmentDocument to DevelopmentProposal mapping

I'm also cleaning up several things which I think we should consider as standards:

* removing IdClass from S2sOppForms, converting to EmbeddedId
* changing S2sOpportunity temporal types from javax.sql to data.util types... It makes sense to move away from the sql datatypes since they end up polluting our application with jdbc datatypes and we have to convert to and from Calendar types...