Dealing with configs in a better way

[vuillaut]

I think this should solve #924 (implementing solution B discussed there) #208 and improve the way we deal with configs.

• MC now gets its own config file so we stop forgetting about apply_integration_correction
• Users can still work with a limited config file (e.g. containing only an updated tailcut config different from the standard one)
• Users can then use the --update-with to dump a full configuration from that limited config

@SeiyaNozaki could you have a look at the update srcdep config please?

Fixes #924
Fixes #208

[vuillaut]

Note I have also taken the liberty to update min_samples_leaf = 10 since this is what is used for the new MC prod by default.

[codecov]

Codecov Report

Merging #983 (4371d89) into master (18a970c) will increase coverage by 0.03%.
The diff coverage is 94.28%.

@@            Coverage Diff             @@
##           master     #983      +/-   ##
==========================================
+ Coverage   85.66%   85.69%   +0.03%     
==========================================
  Files          78       78              
  Lines        6570     6598      +28     
==========================================
+ Hits         5628     5654      +26     
- Misses        942      944       +2     

Impacted Files	Coverage Δ
lstchain/io/config.py	94.87% <88.88%> (-5.13%)	⬇️
lstchain/io/tests/test_config.py	100.00% <100.00%> (ø)

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[SeiyaNozaki]

Thank you @vuillaut !
It looks fine from my side.