Adding entry point for use by other python scripts.
Adding entry point for use by other python scripts.

Added unpack(...) function to allow the script to be easily called from
other python scripts.

Original-Change-Id: Ia261e63c58bdfd92e7400f6a93074b203d28976f

OSEHRA/VistA,OSEHRA/VistA,josephsnyder/VistA,mdgeek/VistA-FHIR-CWF,shabiel/VistA,josephsnyder/VistA,shabiel/VistA,OSEHRA-Sandbox/VistA,OSEHRA-Sandbox/VistA,apexdatasolutions/VistA,OSEHRA/VistA,apexdatasolutions/VistA,josephsnyder/VistA,OSEHRA-Sandbox/VistA,shabiel/VistA,OSEHRA-Sandbox/VistA,mdgeek/VistA-FHIR-CWF,apexdatasolutions/VistA,josephsnyder/VistA,mdgeek/VistA-FHIR-CWF,OSEHRA/VistA,apexdatasolutions/VistA,jasonli2000/VistA,mdgeek/VistA-FHIR-CWF,timmvt/VistA_tt,apexdatasolutions/VistA,OSEHRA-Sandbox/VistA,jasonli2000/VistA,OSEHRA/VistA,timmvt/VistA_tt,jasonli2000/VistA,josephsnyder/VistA,josephsnyder/VistA,timmvt/VistA_tt,shabiel/VistA,shabiel/VistA,mdgeek/VistA-FHIR-CWF,jasonli2000/VistA,OSEHRA/VistA,mdgeek/VistA-FHIR-CWF,timmvt/VistA_tt,timmvt/VistA_tt,shabiel/VistA,OSEHRA-Sandbox/VistA