Add DL3+ notebooks

[chaimain]

Adding 5 notebooks:

• MC DL2 to IRF (source-independent, fixed global and energy-dependent gammaness and theta cuts)
• DL2 to DL3 (source-independent, fixed global and energy-dependent gammaness cuts)
• DL3 to DL4 (using gammapy v0.19 and saving DL4 as OGIP files)
• plot LC from DL4 (OGIP files)
• plot SED from DL4 (OGIP files)

The energy-dependent cuts procedures follows #709

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Merging #895 (4db9f1d) into master (71b217e) will not change coverage.
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  Files          77       77           
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  Hits         5240     5240           
  Misses        930      930           

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[rlopezcoto]

After v0.9 we should try to make all notebooks work with the current version of lstchain

[maxnoe]

Why are there notebooks for things that are supposed to be done with the tools, e.g. create_dl3_events_file and create_irfs?

[chaimain]

Why are there notebooks for things that are supposed to be done with the tools, e.g. create_dl3_events_file and create_irfs?

To just show the workflow of the Tools.

[maxnoe]

@chaimain But the notebooks duplicate code from the tools.

[chaimain]

@chaimain But the notebooks duplicate code from the tools.

Yes. I do not understand, how I can explain the workflow of the Tools, without doing so in a jupyter notebook. Can you elaborate more on this?

[maxnoe]

@chaimain You show how you run the tools and explain what they do shortly in prose? Have a look in the inputs/outputs?

We really should not duplicate the code in notebooks that is supposed to be run via command line tools.

People who really want to understand the code need to look at the code, we shouldn't repeat it in a notebook

[chaimain]

@chaimain You show how you run the tools and explain what they do shortly in prose? Have a look in the inputs/outputs?

We really should not duplicate the code in notebooks that is supposed to be run via command line tools.

People who really want to understand the code need to look at the code, we shouldn't repeat it in a notebook

Ok. I understand it now. Thanks!
I will fix the notebooks accordingly.

[chaimain]

@maxnoe should the --help-all section be run in the notebook?

[rlopezcoto]

as commented at the beginning of the discussion, after the new release we should update all notebooks to make them work with the current version of lstchain and some of them like these ones should not contain the information that is better explained elsewhere (as in gammapy notebooks)

already discussed and modifications will be implemented in the future