Merge branch 'cleanup/fvector-member-initialization' into 'master'

[Cleanup] Fix GCC warning by properly initializing member



See merge request !41

dune/common/fvector.hh

@@ -105,7 +105,7 @@ namespace Dune {
 
     //! Constructor making default-initialized vector
     constexpr FieldVector()
-      : _data{}
+      : _data{{}}
     {}
 
     //! Constructor making vector with identical coordinates