CASE - Auto recovery case code list

   Name : DCLCASE

   Function:
   A case code is set up to represent one or more error codes or return codes.  A function may use this
   by allowing a case code to be given instead of one or more error or return codes, the case code will
   then represent all the codes in its list.  The list is not recursive, a code in the list is not
   regarded as another case code.  The lists are placed adjacent in storage, the start address of list
   i+1 is the end address of list i.