Add additional aux plots in the comparison of PFOs and Flow Elements

Hi (cc @mhodgkin @cdelitzs )

Added the plots for flow element comparison with PFO with all variables that are defined in both. I neglected the following plots as the aux are not available (or I don't think the info tells us anything not otherwise picked up):

• PFOEMPlots (aux not available in FE)
• PFOPVMatchedPlots (these are just a subset of cPFO/cFE which are matched to primary vertex and dump the basic kinematics - global plot might pick up issues here anyway since the PFO/FE are matched to same vertex)
• PFOAttributePlots - the only aux available in FE is the timing so only this is compared.

I decided not to include the eta binned subsets, because I did not feel these were so necessary - Since the PFO and the FE will use the same base object (either a track or a topocluster), they would naturally fall into the same eta bin for both FE and PFO - hence I don't think the binned observable will tell us anything more than the unbinned case.

The plots I have only compares the ratio between the various observables (defined as var_PFO/var_FE), for want of a better solution to do the comparison. Binning granularity can also be changed in a later MR, but chose one on the basis that variations between matched objects should be small (although can be -ve if a debug value is called).

Please let me knowif there are any issues with this MR.

Thanks

Matt A.