moving Quantity private doctests to pytests. (#913)

This part required some changes in `mathics.builtin.quantity`, because the original one was not compatible with MathicsSession evaluation.
Mathics3 · Sep 8, 2023 · e2af6c8 · e2af6c8
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diff --git a/CHANGES.rst b/CHANGES.rst
@@ -33,7 +33,7 @@ Bugs
 
 * Improved support for ``DirectedInfinity`` and ``Indeterminate``.
 * ``Definitions`` is compatible with ``pickle``.
-
+* Inproved support for `Quantity` expressions, including conversions, formatting and arithmetic operations.
 
 Package updates
 +++++++++++++++