A pig chromosomes gallery: a modified makeMosaic function

I fixed a bug in the makeMosaic function in the script used to build a chromosomes gallery. Instead of removing, too small or to large particles from a list, now the makeMosaic function build a new list of filtered particles (chromosomes). The script was modified to display chromosomes in inverse DAPI with

pylab.set_cmap(pylab.cm.Greys)

Inverse DAPI pig chromosomes

Original pig DAPI stained metaphase