Update the XPAR test functions to accommodate the MUMPS changes
Update the XPAR test functions to accommodate the MUMPS changes

The new ZVDPXPAR wrapper functions now return JSON strings instead of
putting values into the ^TMP global, making function calls a lot cleaner.

vistadataproject/nonClinicalRPCs,vistadataproject/nonClinicalRPCs,vistadataproject/nonClinicalRPCs