first try of interaction counter

make vertical_EAS non-test executable

modified vertical_EAS for interaction counting project

more bins on upper end

disable energy loss, read A,Z,E from argv

back to SIBYLL decays

add QGSJet

redesigned/refactored LuminosityCounter

const-correctness in Sibyll/NuclearInteraction

updated vertical_EAS to new LuminosityCounter design

comply to C++ standard

renamed to InteractionCounter