STY: avoid import * pattern

[jbrockmendel]

Moving away from it would be a PITA since it is used a bunch, but this pattern makes it difficult for newcomers to see where things are defined.

[eric-wieser]

The new practice from @shoyer of overriding __module__ = "numpy" makes finding things even harder.

I find that with a mildly smart editor that is aware of function definitions, the problem you describe doesn't affect me much.

I'm not sure the effects of such a change are a net positive effect on maintainability, let alone if they're worth the transition cost.

[rgommers]

There's two things here:

1. import * by end users - if this is in our docs anywhere, we should fix it
2. import * internally in NumPy; this isn't really an issue. Even ?? in IPython will tell you exactly where things are defined. And locating things defined in C is way harder anyway.

[jbrockmendel]

closing as duplicate of #13525