create temporary DOMText node, for use until Text node supports HTML
delete TODO
add to git
fix header comment
pass only the probe to ProbeNode
switch to ModelViewTransform2
use same scale arg for XY in mvt
fix shape so that it works correctly with mvt
fix shape so that it works correctly with mvt
4/25/13 adjust how faucet pipe length is computed, in model and view
4/25/13 correct some mvt errors in Concentration tab, by testing with non-unity mvt
use identify mvt in Concentration tab