NN code: some progress

[Richard A. O'Keefe]

It was suggested that I try changing
    :: Matrix :== !{!Vector}		// Version A.
to
    :: Matrix :== !{#Vector}		// Version B.

Well, I tried it.  Here are the times I got just now.

    Version A:
	453 sec (user) + 13 sec (GC) = 466 sec (total).

    Version B:
	507 sec (user) + 14 sec (GC) = 521 sec (total)

Interesting, no?