Add benchmark tests

[lcorcodilos]

• Plotting the Missing ET (or any event level variable).
• Plotting the Jet pT (or any variable that is a per-event array).
• Plotting the Jet pT for jets that have an jet pT > 20 GeV and abs(jet eta) < 1.0
• Plotting the Missing ET for jets with at least 2 jets with Jet pT > 40 and abs(jet Eta) < 1.0
• Plot the opposite-sign muon pair mass for all combinations of muons
• Plot the Missing ET for events that have an opposite-sign muon pair mass in the range 60-120 GeV (double loop over single collection, math)
• Plot the sum of the pT of jets with pT > 30 GeV that are not within 0.4 from any lepton with pt > 10 GeV (looping over two collections)
• Plot the transverse mass of the Missing ET and a lepton for events with at least 3 leptons and two of the leptons make up a Z (same flavor, opp sign, closest to invar mass of 91.2 GeV), where the lepton being plotted is the third lepton.
• Create a group of plots (jet pT, eta, phi, N_jets). Now make it for all events, for events with missing et > 20 GeV, and for events with missing et > 20 GeV and 2 jets with 40 GeV and abs(eta) < 1.0. Demonstrate making “groups” of plots, and a graphical cut flow

[lcorcodilos]

1-6 done in commit to test_dev

[lcorcodilos]

7, 8 now done as well in this commit

[lcorcodilos]

Finished with #16