adding abiltiy to change legend line orientation
Allow legend symbols/lines to be horizontal as well as diagonal
Added a "plotlabel" to PlotItem. The plotlabel goes in the upper left corner of the plot's layout (position 0,0; previously unused) as a "panel label".
This allows easy labeling of multple plots in a graph, as typically used in scientific papers.
Merge branch 'develop' of github.com:pyqtgraph/pyqtgraph into develop-LegendEnhancements