New digraph

[Randy Meyers 381-2743 ZKO2-3/N30 27-Nov-1991 1903]

Doug is right.  It is impossible to be consistent with other programming
languages here, because they are already inconsistent.

Ada is a Pascal derived language, yet Ada uses <> (called a "box" by Ada
programmers) to stand for undefined ranges (or other things that aren't
filled in).

Thus:

	type VECTOR is array(INTEGER range <>) of real;

is more or less like the C definition:

	typedef float VECTOR[];