Test mcbm beamtime setups 2020_03 and 2021_03 instead of the 2019 ones.
Correct the reconstruction macro accordingly.

Macro produces histograms of origin points for delta
electrons which hit a STS detector in mcbm_transport_beam.C
simulation.

x and y coordinates where switched in SetBeamAngle() call. Fixed.

Apply code formatting to all source/header files and root macros.

The macros in the SVN development branch are the latest versions.

This version is an exact copy of the last revision of the trunk branch
of the old SVN repository of CbmRoor at
https://subversion.gsi.de/cbmsoft/cbmroot/trunk
The old SVN repository will still be available for read access.