fixed bug LCIO-42 - made id() const
fixed bug LCIO-42 - made id() const


petricm/LCIO,iLCSoft/LCIO,iLCSoft/LCIO,iLCSoft/LCIO,iLCSoft/LCIO,iLCSoft/LCIO,petricm/LCIO,petricm/LCIO,petricm/LCIO,petricm/LCIO,iLCSoft/LCIO,petricm/LCIO