Added custom prefixing to Dict2tuple.cpp
Added a neat new property to Dict2tuple.cpp which allows to set a custom prefix to the variables in the dictionary. This also resolves the JIRA task https://its.cern.ch/jira/browse/LHCBPS-1666
Added a neat new property to Dict2tuple.cpp which allows to set a custom prefix to the variables in the dictionary. This also resolves the JIRA task https://its.cern.ch/jira/browse/LHCBPS-1666