Add GeomDeviation class
Move static geometry functions to GeomUtils
Use GeomDeviation tolerances in GeomConnector routines
Use GeomDeviation/GeomUtils-based routines in clipper
Fix EdMultipolygon.reuseExistingNodes()
Remove reuseExistingNodes' dependency on GeomConnector
Remove connectExistingTouchingNodes' dependency on GeomConnector
Remove all remainders of GeomConnector
Ruian: adaptive reuse of near nodes