Clarified point of Cython. Added commented-out item that should apply by 1.0.
Clarified point of Cython. Added commented-out item that should apply by 1.0.

Tasignotas/topographica_mirror,ioam/topographica,mjabri/topographica,mjabri/topographica,Tasignotas/topographica_mirror,Tasignotas/topographica_mirror,ioam/topographica,Tasignotas/topographica_mirror,mjabri/topographica,ioam/topographica,mjabri/topographica,mjabri/topographica,ioam/topographica,Tasignotas/topographica_mirror,ioam/topographica