improve doxygen, remove license from doxygen comment block

Framework/Random/UniformRealDistribution.h

Framework/Random/testRandom.cc

Framework/StackInterface/ParticleBase.h

Framework/StackInterface/Stack.dox

Framework/StackInterface/Stack.h

Framework/StackInterface/StackIterator.h

Framework/StackInterface/testStackInterface.cc

Framework/Units/testUnits.cc

Framework/Utilities/Bit.h

Framework/Utilities/COMBoost.cc

Framework/Utilities/COMBoost.h

Framework/Utilities/CorsikaFenv.h

Framework/Utilities/CorsikaFenvDefault.cc

Framework/Utilities/CorsikaFenvFallback.cc

Framework/Utilities/CorsikaFenvOSX.cc

Framework/Utilities/Singleton.h

Framework/Utilities/testCOMBoost.cc

Framework/Utilities/testCorsikaFenv.cc

Framework/Utilities/try_feenableexcept.cc

Main/Environment.h