ENH: Make numpy ufuncs compatible with Python divmod.

The following numpy ufuncs are reimplemented using the npy_divmod
function.

- remainder ('%')
- floor_divide ('//')

Example of differences

Currently

    In [1]: a = np.array(78 * 6e-8)

    In [2]: b = np.array(6e-8)

    In [3]: a // b
    Out[3]: 77.0

    In [4]: a % b
    Out[4]: 5.9999999999999651e-08

Previously

    In [1]: a = np.array(78 * 6e-8)

    In [2]: b = np.array(6e-8)

    In [3]: a // b
    Out[3]: 78.0

    In [4]: a % b
    Out[4]: 0.0

The first agrees with the Python values for the same operation and is a
bit more accurate for the input values as represented internally.

Closes #7224.

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