Copy hs wca cell test

implement iprint and verbosity options for modified_fire, add tests to constructor of hs_wca, implement high level test for hs_wca potential to compare the scaling with and without cell lists
are you referring to this:

http://docs.scipy.org/doc/numpy-1.8.1/reference/generated/numpy.testing.Tester.bench.html#numpy.testing.Tester.bench

yes that would be cool

On Tue, Nov 25, 2014 at 10:39 AM, Julian Schrenk <notifications@github.com>
wrote:

> In playground/hs_wca_cell_lists/hs_wca_cell_lists.py:
>
> > @@ -20,142 +23,330 @@ def to_string(inp, digits_after_point = 16):
> >      format_string += "f}"
> >      return format_string.format(inp)
> >
> > +def put_in_box(x, boxvec):
>
> OK, now the function is imported.
>
> —
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> <https://github.com/pele-python/pele/pull/99/files#r20854598>.
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