Fixed TransferProduct ejectile energy and theta calculations in LAB and CoM frame

[Pezkoo]

Fixed ejectile energy and theta calculations in LAB and CoM frame + fixed beta calculation

[Pezkoo]

This is now being merged to the main branch, but is it still possible to create a new branch where this change is merged to?

[lpgaff]

This is now being merged to the main branch, but is it still possible to create a new branch where this change is merged to?

We can test it from your own branch/fork by making a clone of it with a different name at CERN. As we fix any bugs or make updates, you can just push the changes as normal and this Pull Request will update. Then when we're happy that it works, we can merge it to the main branch.

[lpgaff]

Great work! Thanks Vili, this is wonderful.

Still a few more steps to correctly account for the energy loss and the annoying user options, but we can merge now and tweak that later.

Once everything is working nicely, we should port this over to the CalculateRecoil and CalculateEjectile functions.

But for the upcoming experiment, this is the priority, so let's merge!