Fixed bug in independent mask initialization for CFs
Fixed bug in independent mask initialization for CFs

Without the x and y position in the label string all masks were
identical even if same_cf_shape_for_all_cfs was False.

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