Fix setup of signal particle gun directory name based on the beam energy.
Port the merge of branch 'LHCBGAUSS-1773' into 'master'
See merge request !492 (merged) for 'Sim09'
(cherry picked from commit de226c68)
cf632138 Fix setup of signal particle gun directory name based on the beam energy.
5c7a91d1 Add signal particle gun test
b7a365b9 Update event type for signal particle gun test
69b38e70 Add check that correct event type was processed
0efcad3d Small update of gauss-gen-12143001-signal-pgun.qmt to make failures more readable.