Remove "sci" calls that break embedding in wx. Switch from pylab to pyplot

[hagberg]

Switch to using pyplot interface instead of pyplot.
Remove pylab.sci() calls that break embedding in gui canvases. I couldn't figure out why pylab.sci() was needed and I think it is safe to remove them.

[bjedwards]

After reading what I could find in the docs onpylab.sci(), I am still unsure exactly what it does, but in the uses I've seen don't seem to relate to ours. Are we sure this isn't going to introduce some odd subtle bug down the road?

[hagberg]

On Sun, Aug 5, 2012 at 12:08 PM, Ben Edwards
reply@reply.github.com
wrote:

After reading what I could find in the docs onpylab.sci(), I am still unsure exactly what it does, but in the uses I've seen don't seem to relate to ours. Are we sure this isn't going to introduce some odd subtle bug down the road?

It might cause some issues, but I couldn't find any in my testing. I
ran the networkx drawing examples and they worked fine. It might be
that when using colormaps for both edges and nodes this has an effect
(which is the active colormap).

In the long run this code needs to be substantially reworked.