MATLAB hold-overs in Fourier Bessel zero finding method

[chris-langfield]

The following should be modified to be a list of arrays (possibly of variable lengths, for each ell), rather than a zero padded NumPy array.

cf. #599

ASPIRE-Python/src/aspire/basis/basis.py

Lines 79 to 85 in 6cb389e

	max_num_zeros = max(len(z) for z in zeros)
	for i, z in enumerate(zeros):
	zeros[i] = np.hstack(
	(z, np.zeros(max_num_zeros - len(z), dtype=self.dtype))
	)
	self.r0 = m_reshape(np.hstack(zeros), (-1, self.ell_max + 1)).astype(self.dtype)

[garrettwrong]

Merged, closing.