[ADD] web_pivot_computed_measure

web_pivot_computed_measure/readme/CONTRIBUTORS.rst

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+* `Tecnativa <https://www.tecnativa.com/>`_:
+
+  * Alexandre D. Díaz
+  * Pedro M. Baeza

web_pivot_computed_measure/readme/DESCRIPTION.rst

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+Adds support for computed measures on the pivot view

web_pivot_computed_measure/readme/ROADMAP.rst

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+#. Add support to define a style for a computed measure (ex. colored)

web_pivot_computed_measure/readme/USAGE.rst

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+Go to pivot view and click on the "Measures" menu, you will see
+a new option called 'Computed Measure'.
+
+You have the follow options to create a 'computed measure':
+ - Measure 1: Used in 'operation formula' as 'm1'
+ - Measure 2: Used in 'operation formula' as 'm2'
+ - Operation: The formula
+    - Sum: m1 + m2
+    - Sub: m1 - m2
+    - Mult: m1 * m2
+    - Div: m1 / m2 (Format: Float)
+    - Perc m1 / m2 (Format: Percentage)
+    - Custom: Special option only visible in debug mode to write a custom formula.
+ - Name: The name of the new measure (emtpy = auto-generated)
+ - Format: How will the value be printed
+    - Integer
+    - Float
+    - Percentage (value * 100)
+ - Formula*: Custom operation formula
+    These formula is evaluated using 'PY.eval'
+
+These computed measures can be mixed (You can reuse it to make new computed measures) and saved as favorites.
+
+Notice that "measures/computed measures" involved in an active 'computed measure'
+can't be deactivated until you have deactivate the 'computed measure'.