[CAM] separate tolerance variable used for arc fitting from tolerance used for section height offsets

src/Mod/CAM/libarea/Arc.cpp

@@ -50,11 +50,11 @@ double CArc::IncludedAngle() const
 bool CArc::AlmostALine() const
 {
     Point mid_point = MidParam(0.5);
-    if (Line(m_s, m_e - m_s).Dist(mid_point) <= Point::tolerance) {
+    if (Line(m_s, m_e - m_s).Dist(mid_point) <= Point::arc_tolerance) {
         return true;
     }
 
-    const double max_arc_radius = 1.0 / Point::tolerance;
+    const double max_arc_radius = 1.0 / Point::arc_tolerance;
     double radius = m_c.dist(m_s);
     if (radius > max_arc_radius) {
         return true;  // We don't want to produce an arc whose radius is too large.

src/Mod/CAM/libarea/Curve.cpp

@@ -14,6 +14,7 @@ const Point operator*(const double& d, const Point& p)
     return p * d;
 }
 double Point::tolerance = 0.001;
+double Point::arc_tolerance = 0.001;
 
 // static const double PI = 3.1415926535897932; duplicated in kurve/geometry.h
 

src/Mod/CAM/libarea/Point.h

@@ -58,6 +58,7 @@ public:
     {}  // vector from p0 to p1
 
     static double tolerance;
+    static double arc_tolerance;
 
     const Point operator+(const Point& p) const
     {