Stripped out test for old gnuplot. Added xlabel, ylabel, and replot methods.
Stripped out test for old gnuplot.
Added xlabel, ylabel, and replot methods.


git-svn-id: 8c9cf565d959f48f2495bfea3c697473c881f37a@4 67c13c2a-ce2d-4362-9fbd-a73952e22801

tschaume/gnuplot-py,tschaume/gnuplot-py