Geant4 physics processes for silicon microdosimetry simulation: Improvements and extension of the energy-range validity up to 10 GeV/nucleon

Various corrections are added to the MicroElec extension in Geant4, for both incident electrons and protons, in order to extend the energy-range validity of the models. Additional modifications are also made to ease the use in compliance with other Geant4 models. The models are now valid for incident electrons of energy 16.7 eV to 100 MeV and incident protons and heavy ions of energy 50 keV/nucleon up to 10 GeV/nucleon.