geometry: Clean up some code and continue refactoring of geometry view.

src/Model/Geometry/PointXYZ.py

@@ -47,7 +47,7 @@ class PointXYZ(Point):
         Returns:
             True if at least one coordinate is as np.nan
         """
-        return pd_is_na(self.x()) or pd_is_na(self.y()) or pd_is_na(self.z())
+        return pd_is_na(self.x) or pd_is_na(self.y) or pd_is_na(self.z)
 
     @staticmethod
     def distance(p1, p2):
@@ -60,4 +60,4 @@ class PointXYZ(Point):
         Returns:
             Euclidean distance between the two points
         """
-        return dist((p1.x(), p1.y(), p1.z()), (p2.x(), p2.y(), p2.z()))
+        return dist((p1.x, p1.y, p1.z), (p2.x, p2.y, p2.z))