The maximum edge length for the Mefisto mesher is always set in the accept() method so that effectively user input is always ignored.
There is now a button Estimate to guess a good default value. And user input is no longer ingored
X and Y were changed at first by me to PropertyLength and later by Wandererfan to PropertyDistance. For this second change there is handleChangedPropertyType() code missing. This PR adds this.
- also some code formatting improvements automatically done by MSVC