Adding a script to make BX histograms for the Time Alignment of the Calo.
This MR goes together with Moore!1111 (closed)
generated with: /cvmfs/lhcb.cern.ch/lib/var/lib/LbEnv/2199/stable/linux-64/bin/lb-dev --nightly=lhcb-head/Tue -c x86_64_v2-centos7-gcc10-opt Moore/HEAD