psyplot plot methods

This plugin defines the following new plot methods for the psyplot.project.ProjectPlotter class. They can, for example, be accessed through

In [1]: import psyplot.project as psy

In [2]: psy.plot.linreg
Out[2]: <psyplot.project.ProjectPlotter._register_plotter.<locals>.PlotMethod at 0x7f0feea5c3a0>

linreg(*args, **kwargs)	Draw a fit from x to y
densityreg(*args, **kwargs)	Make a density plot and draw a fit from x to y of points