Sketcher SelectElementsWithDoFs

Description
This tool is meant to aid in fully constraining a sketch by highlighting in green the sketch elements with remaining degrees of freedom (DoF).

How to use

 * 1) In the Solver messages box located at the top of the Tasks tab, the following message should be displayed: "Under-constrained sketch with X degrees of freedom" where "X" is the number of degrees of freedom remaining in the sketch; click on the blue link, or use the menu.
 * 2) The elements which have degrees of freedom are highlighted in green.
 * 3) Click anywhere in the sketch to clear the highlight color.