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Add di-Jpsi+tracks, etac->6pi, and update BPHY23

Xin Chen requested to merge xchen/athena:mytopic into 21.2

Following the successful reconstruction of X->Jpsi+etac->2mu+4pi: We now add the channel X->Jpsi+etac->2mu+6pi. Tetraquark 3-body decay X6900 -> X6400 + 2pi is also possible, as well as the tri-charmonium production of 2Jpsi+etac, so we added di-Jpsi+tracks channels as well. One new c++ file (DiJpsiPlusTracksSingleVertex) is added for this purpose, and BPHY23 is updated.

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