Fixed bug in decode_feature from 2007: was ignoring all but one of any activity value for a given feature value.  Not previously detected because each feature value was distinct for orientation and face preference maps, but for position maps there appear to be multiple with the same feature values but different activity values.
Fixed bug in decode_feature from 2007: was ignoring all but one of any activity value for a given feature value.  Not previously detected because each feature value was distinct for orientation and face preference maps, but for position maps there appear to be multiple with the same feature values but different activity values.

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