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indent, include new ControlPlots.h
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separating out the plugin control plots

previously they were all in the ToyTree class, now
they have their own class ControlPlots.
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Using the ToyTree class for 2D plugin scans

Also fixed a couple of control plots to work with 2D scans.
Mostly changed the ndof for the Prob function.

Moved the p-value control plot into its own canvas. Now
it looks ugly, needs more work.

2D plugin toys now get saved into a subdirectory, just as 1D
plugin toys do.
determine 2D plugin bins automatically from files

Improved the ComputeMinMaxN() function of ToyTree to
also compute these things for the y axis.
omitting a few root warnings

a few warnings where present when reading in old toys that
don't have the y variables yet