PU cleaning + setting up pipeline

• Fix instructions to use LFS
• Remove deprecated tables
• Add pipeline (a priori this has nothing to see with PU cleaning, but the additional safeties applied on the whole group imply that a pipeline must be set and successful + I was too lazy to make another MR)

PUcleaning/README.md

@@ -14,6 +14,6 @@ Note: for the UL18 jet data, the tables were produced with command `getHighScale
 ## Large file storage
 
 The tables being rather large, please use git LFS to handle them. Here is a brief recipe on how to proceed:
-- The very first time, run `git lfs install` (do this once per local repo).
-- Before adding a new file, use `git lfs track [file]` (do this once per file).
-- Then you may add the file as usual with `git add [file]` (do this each time you change the file).
+- If you have never used git LFS and if it is not installed (it should be done automatically by the installer from [2e22f769](https://gitlab.cern.ch/cms-analysis/general/DasAnalysisSystem/gitlab-profile/-/merge_requests/24/diffs?commit_id=2e22f769c3e3a8c376aa4784a90e1c437d17d697)), run first of all `git lfs install` (do this once per local repo).
+- If you want to pull an existing file, run `git lfs pull`.
+- If you want to push a new file, first use `git lfs track [file]` (do this once per file), then handle the file as usual with `git add` and `git commit` (do this each time you change the file).