[Matrix-SIG] We should rename convolve in multiarraymodule

[Les Schaffer]

> While I've mentioned this privately to some members of the list, I
> thought I might suggest it to all users of NumPy to see the
> reaction.

yes, absolutely please correct the name. its way too easy to write a
perl script to change instances of convolve to correlate in python
codes, even 35k lines. 

btw, the latest pdf of the docs for NumPy has no entry for convolve in
it -- its the null set actually, the title is there but the info is
empty. (Page 52).

les schaffer