Likelihood reconstruction update

[gabemery]

This pull request covers 4 small changes:

1. Adds the extraction of the pedestal variance used in the likelihood function from interleaved events. This was already covered in Use interleaved events to get the pedestal std deviation in the likelihood reco #1124 but not merged at the time. This is more stable than the current, event-wise extraction and allows to account for pixel differences. It is also needed for data after DVR.
2. Clean up a test and log message from when the code needed to be pre-compiled
3. Add support of source dependent analysis with the likelihood reconstruction
4. Remove the 'weight' argument. It was tested during development but is not used anymore.

All of these changes were already tested extensively in a modified version of lstchain 0.9.8

I also checked that it run successfully up to the creation of DL2 files in the current version on small v0.10 (no DVR) datasets (without in depth check of the file content). The updated config file fails during training due to #1206

[codecov]

Codecov Report

Attention: Patch coverage is 32.00000% with 34 lines in your changes are missing coverage. Please review.

Project coverage is 72.81%. Comparing base (1d98657) to head (c241816).

Files	Patch %	Lines
lstchain/reco/reconstructor.py	32.00%	17 Missing ⚠️
lstchain/reco/dl1_to_dl2.py	33.33%	6 Missing ⚠️
lstchain/reco/r0_to_dl1.py	20.00%	4 Missing ⚠️
lstchain/scripts/lstchain_dl1_to_dl2.py	33.33%	4 Missing ⚠️
lstchain/reco/reconstructorCC.py	40.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1200      +/-   ##
==========================================
- Coverage   72.92%   72.81%   -0.12%     
==========================================
  Files         133      133              
  Lines       13885    13911      +26     
==========================================
+ Hits        10126    10129       +3     
- Misses       3759     3782      +23     

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[SeiyaNozaki]

Hi @gabemery I reviewed especially the part related to source-dependent analysis. I put the comments there

[SeiyaNozaki]

Thanks for the answers @gabemery
I approved the change of codes related to source-dependent analysis