[Cython] cimport across packages

[Jay Parlar]

On 7/10/08, Anatoly A. Kazantsev <jim-crow at rambler.ru> wrote:
> Oh, I don't split sources to different directories.

Ok, so I *kind* of have it working, in that it works, but I'm not
happy about it. It seems that if I put 'filters.dc.pxd' in *both* the
'filters' directory AND the 'sm' directory, then it happily compiles.
But there must be a better way than copy-pasting.

Jay P.