<bugfix>Fix initial layout of matplotlib cells</bugfix>
<bugfix>Fix initial layout of matplotlib cells</bugfix>

The matplotlib dumpToFile method was using a referenced size object, and therefore did not maintain the initial size.  To fix this, we create a tuple copy of that information.

packages/pylab/figure_cell.py:
  - MplFigureCellWidget.dumpToFile: copy figure size
  - MplFigureCellWidget.saveToPDF: copy figure size

hjanime/VisTrails,hjanime/VisTrails,VisTrails/VisTrails,VisTrails/VisTrails,VisTrails/VisTrails,hjanime/VisTrails,Nikea/VisTrails,Nikea/VisTrails,minesense/VisTrails,celiafish/VisTrails,celiafish/VisTrails,minesense/VisTrails,minesense/VisTrails,Nikea/VisTrails,VisTrails/VisTrails,Nikea/VisTrails,minesense/VisTrails,celiafish/VisTrails,hjanime/VisTrails,minesense/VisTrails,celiafish/VisTrails,hjanime/VisTrails,VisTrails/VisTrails