Updates to PID resampling

Merge Request Title: Updates to PID resampling

Motivation

PID resampling of MC samples

MR description

Moved previous scripts into subdirectory. Now have a new more versatile script for pid resampling (pidgen.py) and another (submit.py) which will launch condor jobs to run the resampling. Currently designed to run on lxplus only and will write directly into the WG eos area. Runs on the lxplus condor system.

How-to

See README.md

Clarity

Please provide an evaluation of the clarity level of the documentation and code (specifically, is the code commented? are the variables self-explanatory?). Please tick the level of clarity of code:

• Bare: README.md and alike are missing. The code is not very well documented. Please try to avoid merging if the code is in this state and spend some time documenting it; this will pay off in the long run.
• Acceptable: any other analyst should be able to understand what is being implemented by this MR with a couple of questions. Code has some comments and variables are reasonably named.
• Complete: README.md exists, code is commented, headers are in place and variables are self-explanatory. I have spent time making sure that this is very clear and ready out of the box. This is the gold standard.

Checks

PID resampling has been run. Checks on-going.

/cc @bldelane