A slow day today so here is a revised itest command with provisional
  support for comparing strings as well :-))
  
  Now table driven to allow the operators
  -eq, -ne, -lt, -gt, -le, -ge, ==, !=, <>, <, >, <=, >=
  
  Uses the expected command modifier for integer compares of width 1, 2 or
  4 bytes of .b, .w, .l and the new modifer of .s for a string compare.
  String comparison is over the length of the shorter, this hopefully
  avoids missing terminators when using an indirect pointer.
  
  eg.
  if itest.l *40000 == 12345678 then; ....
  if itest.w *40000 != 1234 then; ....
  if itest.b *40000 >= 12 then; ....
  if itest.s *40000 -eq hello then; ....