Add custom function and test config for standalone clustering

[jbsauvan]

Adding:

• a customization function to use the standalone clustering implementation.
• a ntuple customization to use the cluster collection produced by the standalone clustering
• a test config to run the standalone clustering

[jbsauvan]

Hi @EmyrClement
Here is PR adding customization functions and test configs to use the standalone clustering. Could you cross-check that it runs as expected and that I didn't miss additional parameter changes?
Thanks!

[EmyrClement]

Hi @jbsauvan this looks ok to me and runs as expected. Should we also add the customisations to run the standalone stage 2 tower sums given the new structure exists for that?

[jbsauvan]

Thanks @EmyrClement for the checks!
Right, I can add the tower customization as well.

[jbsauvan]

Hi @EmyrClement
I have added a custom for the towers as well.
When runnning the standalone tower processor, I noticed that the eta and phi of the towers are always 0, and that the pT distribution is much softer.
Could you have a look?
Thanks!

[EmyrClement]

Hi @jbsauvan regarding the tower pT, this is likely because I did not include the unclustered TCs when producing the towers in the standalone wrapper - the structure of the towers code is closer to the firmware structure, but the inputs and output towers won't therefore make much sense. I ran the existing simulation with includeTrigCells set to false for the tower producer, which gives a pT distribution closer to what I get with the standalone code, but not identical. Is it worth fixing this in the standalone code?

For the eta and phi of the towers, I realised I had not carried them through the standalone code - it's straightforward to fix this.

[jbsauvan]

Hi @EmyrClement
Ok, thanks. That's fine not to include the TCs; anyway I switch to not including the TCs also in the default towers (#477).
Concerning eta/phi, could you open a separate PR with the fix?

[EmyrClement]

I opened #479 to address the eta/phi fix.

[jbsauvan]

Thanks @EmyrClement
I just merged #479