Generalise __truediv__ implementation in BaseTwist

Author: btalb

spatialmath/twist.py

@@ -282,7 +282,7 @@ def __ne__(left, right):  # lgtm[py/not-named-self] pylint: disable=no-self-argu
 
     def __truediv__(left, right):  # lgtm[py/not-named-self] pylint: disable=no-self-argument
         if base.isscalar(right):
-            return Twist3(left.S / right)
+            return type(left)(left.S / right)
         else:
             raise ValueError('Twist /, incorrect right operand')
 
@@ -1714,4 +1714,4 @@ def _repr_pretty_(self, p, cycle):
 
     # import pathlib
 
-    # exec(open(pathlib.Path(__file__).parent.parent.absolute() / "tests" / "test_twist.py").read())  # pylint: disable=exec-used
+    # exec(open(pathlib.Path(__file__).parent.parent.absolute() / "tests" / "test_twist.py").read())  # pylint: disable=exec-used