Refactored pylabplot commands to return matplotlib figure objects
Refactored pylabplot commands to return matplotlib figure objects

The plot_tracked_attributes, matrixplot3d_gnuplot pylabplots have
been removed along with all trailing whitespace.

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