[Numpy-discussion] Added atleast_nd, request for clarification/cleanup of atleast_3d

[Marten van Kerkwijk]

Hi All,

I'm with Nathaniel here, in that I don't really see the point of these
routines in the first place: broadcasting takes care of many of the initial
use cases one might think of, and others are generally not all that well
served by them: the examples from scipy to me do not really support
`at_least?d`, but rather suggest that little thought has been put into
higher-dimensional objects which should be treated as stacks of row or
column vectors. My sense is that we're better off developing the direction
started with `matmul`, perhaps adding `matvecmul` etc.

More to the point of the initial inquiry: what is the advantage of having a
general `np.at_leastnd` routine over doing
```
np.array(a, copy=False, ndim=n)
```
or, for a list of inputs,
```
[np.array(a, copy=False, ndim=n) for a in input_list]
```

All the best,

Marten
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