added cascade example with sibyll, primitive

Documentation/Examples/cascade_example.cc

@@ -24,6 +24,7 @@
 #include <corsika/process/sibyll/ParticleConversion.h>
 
 #include <corsika/units/PhysicalUnits.h>
+
 using namespace corsika;
 using namespace corsika::process;
 using namespace corsika::units;

Framework/Cascade/CMakeLists.txt

@@ -27,6 +27,7 @@ set (
   CORSIKAsibyll_SOURCES
   sibyll2.3c.f
   gasdev.f
+#  rndm_dbl.f
   )
 add_library (CORSIKAsibyll STATIC ${CORSIKAsibyll_SOURCES})
 

Framework/Units/PhysicalConstants.h

@@ -54,9 +54,6 @@ namespace corsika::units::si::constants {
   // unified atomic mass unit
   constexpr quantity<mass_d> u{Rep(1.6605402e-27L) * kilogram};
 
-  // barn moved to PhysicalUnits
-  //  constexpr quantity<area_d> barn{Rep(1.e-28L) * meter * meter};
-  
   
   // etc.