nanshe/wavelet_transform.py: In wavelet_transform, corrected doctest to use proper type.
nanshe/wavelet_transform.py: In wavelet_transform, fixed temporaries to have the same type as the input.
nanshe/wavelet_transform.py: In binomial_coefficients, dropped unnecessary conversions.
nanshe/wavelet_transform.py: In binomial_1D_array_kernel, properly allocated array with a dtype instead of converting using astype.