PWGHF: Add processData and origin flags in treeCreatorD0ToKPi

[atavirag]

I have added flags to distinguish between prompt and non-prompt D0s, and separated between processMC and processData using a PROCESS_SWITCH, so that it can be used on data as well.
Related PR: AliceO2Group/Run3AnalysisValidation#404

[vkucera]

Hi @atavirag , please fix the following problems:

• Fix the reported errors
• Remove code duplication in the two process functions (see https://github.com/AliceO2Group/O2Physics/blob/master/PWGHF/TableProducer/treeCreatorLcToK0sP.cxx)
• Remove repeated calls of .prong0_as (and 1)

[atavirag]

Hi, I am not sure what "clang-format" is asking me to change. I have tried changing the capitalization of acronyms, so that they follow the naming conventions from the documentation, but I still get an error. Do you have any idea what it could be?
Thank you!

[atavirag]

Hi @vkucera, would these changes be okay?

[vkucera]

Thanks @atavirag , please see further comments.

[vkucera]

Add yourself on the list of authors.

[vkucera]

The PR title is too vague. Make it more descriptive.

[atavirag]

I think it is all changed @vkucera

[atavirag]

I just added the changes, sorry for the delay @vkucera

[vkucera]

Thanks @atavirag . Please propagate the configuration changes in the validation framework.

[atavirag]

I had a look, and I think there are no changes to be made in the validation framework, because the tree creator does not seem to be called.

[vkucera]

I had a look, and I think there are no changes to be made in the validation framework, because the tree creator does not seem to be called.

What do you mean by "does not seem to be called"? The JSON configuration needs to be updates with the process switches.