rm unused ZLimits::intersects

Resample/Slice/ZLimits.h

@@ -43,10 +43,6 @@ public:
     double thicknessOr0() const { return isFinite() ? m_zmax - m_zmin : 0; }
 
     bool contains(double z) const { return m_zmin <= z && z <= m_zmax; }
-    bool intersects(const ZLimits& other) const
-    {
-        return other.zBottom() < m_zmax && other.zTop() > m_zmin;
-    }
 
     std::pair<double, double> pair() const { return {m_zmin, m_zmax}; }