Symmetrical wayline-based transition path using asymmetric corner radii by default

[Phrogz]

1. Load this snippet of SCXML:

<state id="A1" viz:xywh="0 0 120 50"/>
<state id="A2" viz:xywh="0 80 120 50">
	<transition event="outside" target="A1" viz:pts="X-35 Y15"/>
</state>

EXPECTED: radii for the two rounded corners are calculated to be the same
ACTUAL:

WORKAROUND: Manually lower the r attribute for the transition until they're forced to be equal (but tight).

[Phrogz]

This would be low-value, but I consider the automatic, attractive presentation of transition routing to be an important feature of the visualization. I find this decidedly unattractive.