Complete Dark Higgs analysis code about coffeagrinder HOT 6 OPEN

This is the working version:
https://github.com/CoffeaTeam/CoffeaGrinder/blob/master/nano_darkhiggs_uproot.py

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@sundleeb

For 7), already implemented. Just compare with what we have in Panda and check if we are missing anything.
For 8), trigger weights already implemented, double check with Panda
For 3), please take care of it.

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@fnavarro94

Take 4), 5, and 6)

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@mcremone I'm gonna take 1), 2), and 9)

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@mcremone 1) and 4) are now completely addressed in CoffeaTeam/coffea#30

There are examples for a bunch of systematics and reweighting now in https://github.com/lgray/dazsle-hbb-columnar.

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New assignments:
Matteo - 1
Allie - 3
Felipe - 5 (important)

Mostly finished
2 and 4

Not as important
6 - 8

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