Merge branch 'feature/fieldmatrix-from-scalar' into 'master'

FieldMatrix: Allow copy construction from scalar

See also !52.

See merge request !140

dune/common/fmatrix.hh

@@ -100,7 +100,7 @@ namespace Dune
 
     template <typename T,
               typename = std::enable_if_t<Dune::IsNumber<T>::value>>
-    explicit FieldMatrix (T scalar)
+    FieldMatrix (T scalar)
     {
       *this = scalar;
     }

dune/common/test/densematrixassignmenttest.cc

@@ -87,8 +87,6 @@ bool run() {
     {
       M fieldT;
       fieldT = constant;
-      // Intentionally disabled: ( compile-time size mismatch )
-      // fieldT = Dune::FieldMatrix<ft, 1, 1>(constant);
     }
 
     // Copy construction
@@ -109,9 +107,7 @@ bool run() {
       }
     }
     {
-      DUNE_UNUSED M const fieldT(constant);
-      // Intentionally disabled:
-      // M const fieldT2 = constant;
+      DUNE_UNUSED M const fieldT = constant;
     }
   }