Expand Interface
  Overview        About the Expand Interface
  __PARGRAB       Retrieve char parameters and Allocate memory
  __RETFREE       Return char to Clipper and Free memory
  __PARGRAB2      Get parameter and grab 2 times it's memory
  __PARGRAB4      Get parameter and grab 4 times it's memory
  __PARGRAB8      Get parameter and grab 8 times it's memory
  __PACKDATE      Pack a date formatted variable to a word
  __PACKTIME      Pack a Time formatted char variable to a word
  __UNPACKDATE    unpack a date formatted variable to a date
  __UNPACKTIME    unpack a Time formatted number to a time string