This patch adds three components to the routine PSNAPIS, supported by Integration Control Registration (ICR) #2531, to provide additional access to the NDC/UPN file (#50.67).

1) INTRAN - This entry point provides input transform lookup functionality for fields that store NDC codes.

2) DRGCLS - This entry point returns class and parent class for a National Drug Code (NDC).

3) QLIST - This entry point provides executable help ("?" or "??") for fields that store NDC codes.