hard limit on fragment numbers in LASSI

[MatthewRHermes]

Caused by the fact that Numpy ndarrays have a maximum dimensionality of 32. Here is one place that this imposes a limit of 31 fragments; there are probably other places in LASSI op_o1. Can this be refactored?

mrh/my_pyscf/lassi/citools.py

Lines 58 to 60 in 0c5f1b1

	addrs = np.stack (np.meshgrid (*[np.arange(l) for l in lroots[::-1,iroot]],
	indexing='ij'), axis=0).astype (int)
	addrs = addrs.reshape (nfrags, nprods[iroot])[::-1,:]

ETA: obviously the solution here is to just do 1 fragment at a time since L60 turns it into a 2d ndarray. But better leave this issue up until all ndarray-related hard limits are removed.