Truth-based efficiency tool

[baltzell]

Given only information from the banks below, write a small and generic tool to extract effencies, to be used in various validation scenarios. Probably should be configurable to only care about certain particle species, and at bare minimum have a command-line interface that stdouts the results in an easily parseable format.

• MC::Particle
• REC::Particle
• MC::GenMatch
• MC::RecMatch