Add test for the QEE lines

FYI @wbarter @ncooke @olupton @yqiu @cvazquez @hyin @dzuliani

This MR adds a simple, temporary test to the qee_upgrade branch that runs our HLT2 lines. It runs the QEE lines over 1000 W+jet events, and an efficiency (approx 75%) is printed. This test should be run by the author and the reviewer of every MR that we target to qee_upgrade.

I updated the QEE Migration Taskforce twiki with some instructions on how to write lines and how to run this test.

It is not intended that each PAWG should have their own test in master, so this new test should be removed before qee_upgrade is merged to master. Hopefully by then we figure out a way in master to tell us the rates and the efficiencies of our lines (see progress in MooreAnalysis!12 (merged) and MooreAnalysis!10 (closed)) on a meaningful signal sample.

As part of this MR I also add the QEE lines to the list of lines configured by the test_all_hlt2_lines. So you can run that test and you should see the QEE lines there too. This test is in master.