polyBoundaryMesh::groupPatchIDs(): Make name clash between patch and group name fatal

If this clash is allowed boundary conditions set by wildcards are
processed incorrectly.

src/OpenFOAM/meshes/polyMesh/polyBoundaryMesh/polyBoundaryMesh.C

@@ -445,14 +445,15 @@ Foam::polyBoundaryMesh::groupPatchIDs() const
 
                 if (findPatchID(name) != -1)
                 {
-                    WarningInFunction
-                        << "Patch " << bm[patchi].name()
-                        << " specifies a group " << name
-                        << " which is also a patch name."
-                        << " This might give problems later on." << endl;
+                    FatalErrorInFunction
+                        << "Patch '" << bm[patchi].name() << '\''
+                        << " specifies the group '" << name << '\''
+                        << " which clashes with a patch name." << nl
+                        << "    Please choose patch names"
+                           " which are not patch type/group names."
+                        << exit(FatalError);
                 }
 
-
                 HashTable<labelList, word>::iterator iter = groupPatchIDs.find
                 (
                     name