set the log property. If log is true and max or min is zero or negative, then the values are reset to make them valid.
true if a lock is out and an object is rapidly mutating the object. clients listening for property changes can safely ignore property changes while valueIsAdjusting is true, as they should receive a final propertyChangeEvent after the lock is released. (note it's not clear who is responsible for this. See http://www.das2.org/wiki/index.php/Das2.valueIsAdjusting)