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/stressAnalysis/solidEquilibriumDisplacementFoam/beamEndLoad/system/controlDict

@@ -15,6 +15,8 @@ FoamFile
 }
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
+application     solidEquilibriumDisplacementFoam;
+
 startFrom       latestTime;
 
 startTime       0;