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Deviations from standard Modula-2

A few changes have been made to make Modula-2 programs easier to debug.
This is done primarily via loosening its type strictness:
   * Unlike in standard Modula-2, pointer constants can be formed by
     integers.  This allows you to modify pointer variables during
     debugging.  (In standard Modula-2, the actual address contained in
     a pointer variable is hidden from you; it can only be modified
     through direct assignment to another pointer variable or
     expression that returned a pointer.)
   * C escape sequences can be used in strings and characters to
     represent non-printable characters.  GDB prints out strings with
     these escape sequences embedded.  Single non-printable characters
     are printed using the `CHR(NNN)' format.
   * The assignment operator (`:=') returns the value of its right-hand
   * All built-in procedures both modify _and_ return their argument.