moved "public" in front of ideal gas constant to get brine_co2 fluidsystem to work.

If moved for a good reason, state something in the commit message!

git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@6039 2fb0f335-1f38-0410-981e-8018bf24f1b0

dumux/material/idealgas.hh

@@ -36,10 +36,10 @@ namespace Dumux
 template <class Scalar>
 class IdealGas
 {
+public:
     //! The ideal gas constant \f$\mathrm{[J/mol/K]}\f$
     static constexpr Scalar R = Dumux::Constants<Scalar>::R;
 
-public:
     /*!
      * \brief The density of the gas in \f$\mathrm{[kg/m^3]}\f$, depending on
      *        pressure, temperature and average molar mass of the gas.