ENH: Make numpy floating scalars consistent with Python divmod.

The following numpy scalar floating functions are reimplemented
using the npy_divmod function.

- remainder ('%')
- floor_division ('//')
- divmod

Note that numpy scalars warn on zero division rather than raise.

divmod example, Python floats

    In [1]: a = 78 * 6e-8

    In [2]: b = 6e-8

    In [3]: divmod(a, b)
    Out[3]: (77.0, 5.999999999999965e-08)

Before this commit numpy float64 gave

    In [4]: divmod(float64(a), float64(b))
    Out[4]: (78.0, 0.0)

After this commit numpy float64 gives

    In [4]: divmod(float64(a), float64(b))
    Out[4]: (77.0, 5.9999999999999651e-08)

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