Appion

I updated the name of an include file in 3 files that did not yet reflect a name change, also commented out reference to PlotLine. Checked the resulting graph and still looks good.

code reviewed and found that the reason for PlotLine class to disappear is because jpgraph 3.0.7 moved the class out of its main jpgraph.php script and put it in jpgraph_plotline.php which I didn't include when I updated to the newer version as a side effort of added redux.

This is committed to trunk as r17185 where I uncommented out the line addition. This should generate a horizonal line in the plot.

r17186 added the same to 2.2-redux branch.