TupleVector: inherit all constructors from std::tuple

The previous implementation caused unwanted passes of std::is_assignable with bool.
Furthermore, the previous implementation provided a variadic constructor without any restrictions causing hard to track compiler errors in the std::forward part.

dune/solvers/common/tuplevector.hh

@@ -22,15 +22,8 @@ namespace Solvers
 
   public:
 
-    /** \brief Construct from a set of arguments */
-    template<class... TT>
-    constexpr TupleVector(TT&&... tt) :
-      Base(std::forward<TT>(tt)...)
-    {}
-
-    /** \brief Default constructor */
-    constexpr TupleVector()
-    {}
+    // inherit all constructors from std::tuple
+    using Base::Base;
 
     /** \brief Const access to the tuple elements */
     template<std::size_t i>