[Ticket #11296] - IntegrationServer shall have an HL7 2.5.1 Receiver

Added in new version of NHapi, which has an HL7 2.5.1 model as part of it.  Also
made a minor code update to take into account 2.5.1.
[Requirement #11317] - User can vary slab thickness of MPR display sets
* Committed a pre-compiled version of the viewer algorithms library to the
  ReferencedAssemblies repository.

--HG--
branch : Rigel
[Ticket #11296] - IntegrationServer shall have an HL7 2.5.1 Receiver

Checked in new strong name build of the NHapi files, and specifically of the 2.5.1
model file.

--HG--
branch : Rigel