tutorials: Fixes relating to initialisation

Some tutorials have had Allrun scripts added in order to run setFields,
which was previously omitted. Others have had nonuniform field files in
the 0 directory replaced by uniform files with .orig extensions.

tutorials/DNS/dnsFoam/boxTurb16/0/U.orig

@@ -0,0 +1,51 @@
+/*--------------------------------*- C++ -*----------------------------------*\
+| =========                 |                                                 |
+| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
+|  \\    /   O peration     | Version:  dev                                   |
+|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
+|    \\/     M anipulation  |                                                 |
+\*---------------------------------------------------------------------------*/
+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       volVectorField;
+    location    "0";
+    object      U.orig;
+}
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+dimensions      [0 1 -1 0 0 0 0];
+
+internalField   uniform (0 0 0);
+
+boundaryField
+{
+    patch0_half0
+    {
+        type            cyclic;
+    }
+    patch0_half1
+    {
+        type            cyclic;
+    }
+    patch1_half0
+    {
+        type            cyclic;
+    }
+    patch1_half1
+    {
+        type            cyclic;
+    }
+    patch2_half0
+    {
+        type            cyclic;
+    }
+    patch2_half1
+    {
+        type            cyclic;
+    }
+}
+
+
+// ************************************************************************* //

tutorials/DNS/dnsFoam/boxTurb16/Allclean

@@ -5,6 +5,6 @@ cd ${0%/*} || exit 1    # Run from this directory
 . $WM_PROJECT_DIR/bin/tools/CleanFunctions
 
 cleanCase
-rm -f 0/enstrophy
+rm -rf 0/enstrophy graphs
 
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