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Rounding Tool provides a way to round values with various rounding option but it does not provide a simple way to use it. Also the current RoundingMovel.roundValue() implementation is too slow because it defines round_method() each time it is called.

(Pdb) timeit.timeit('round(12.344, 2)', number=100000)
0.07656502723693848
(Pdb) timeit.timeit('rounding_model.roundValue(12.344)', number=100000)
3.608372926712036

With this merge request, it becomes faster and it also provides a simple method (default ROUND_HALF_UP).

(Pdb) round_ = self.portal.portal_roundings.round                                                       
(Pdb) timeit.timeit('round_(123.45, 2)', number=100000)
1.530869960784912
(Pdb) timeit.timeit('rounding_model.roundValue(123.45)', number=100000)
2.805776834487915

/cc @yusei, @klaus, @jerome