Package.csv: Add DSS vxVistA Specific packages and files.

* Add DSS VxVistA Enhancement ackage with namespace VFD, file No
  from 21602 to 21699.
* Add VPE Shell package with namespace VEEM, ZVEM, file No 19200.
* Add IHS/VA Utilities package with namespace XB.
* Add Sea Islands System Registration package with namespace SIS.
* Add IHS PCC Data Entry package with namespace APC.
* Add namespace DSIW as the secondary namespace for VA Certified
  Components package.
* Add more files to package:
   Pharmacy Prescription Practice
   PCE Patient Care Encounter
   Imaging