reset to lambdaMax when switching to fixed wavelength
doc
update
update
update
4/29/13 handle click offset for wavelength slider thumb
4/29/13 add option to clamp value to range for LinearFunction
use clamp=true for linear function
handle click offset for thumb in wavelength slider and evaporation slider
use scenery's coordinate-frame transform methods in input listeners
minor tweak to MovableDragHandler