from preamble:

"Change Set:		B3DRotationFix
Date:			20 June 2002
Author:			Joshua Gargus

Before this fix, the following erroneous behavior was observed:

(B3DRotation from: 0 at 0@1 to: 0 at 1@0) angle => 0.0
(B3DRotation from: 0 at 0@1 to: (0 at 1@1) normalized) angle => 180.0

This changeset fixes the problem, also addressing the special cases of
rotating between parallel vectors with both the same and opposite
orientations.
"!
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