allow constructing JFunc from variables

also add equality operator

opm/parser/eclipse/EclipseState/Tables/JFunc.hpp

@@ -32,7 +32,11 @@ public:
     enum class Flag { BOTH, WATER, GAS };
     enum class Direction { XY, X, Y, Z };
 
+    JFunc();
     explicit JFunc(const Deck& deck);
+    JFunc(Flag flag, double ow, double go,
+          double alpha, double beta, Direction dir);
+
     double alphaFactor() const;
     double betaFactor() const;
     double goSurfaceTension() const;
@@ -40,6 +44,8 @@ public:
     const Flag& flag() const;
     const Direction& direction() const;
 
+    bool operator==(const JFunc& data) const;
+
 private:
     Flag       m_flag;             // JFUNC flag: WATER, GAS, or BOTH.  Default BOTH
     double     m_owSurfaceTension; // oil-wat surface tension.  Required if flag is BOTH or WATER