STYLE: adjust tutorial Allrun scripts (issue #310)

- A few without a 'cd' at the start.
  Use $(getApplication) directly in more places (for clarity).

tutorials/mesh/foamyHexMesh/mixerVessel/Allrun-pre

@@ -16,8 +16,6 @@ intersectSurfaces()
         surfaceBooleanFeatures intersection "$@"
 }
 
-# Set application name
-application=$(getApplication)
 
 \rm -rf 0
 

tutorials/mesh/foamyHexMesh/mixerVessel/Allrun-simulation

@@ -6,9 +6,6 @@ cd ${0%/*} || exit 1    # Run from this directory
 
 cp system/controlDict.flow system/controlDict
 
-# Set application name
-application=$(getApplication)
-
 rm -rf 0
 
 runApplication createBaffles -overwrite
@@ -17,7 +14,7 @@ runApplication mergeOrSplitBaffles -split -overwrite
 # Get rid of zero faced patches
 runApplication createPatch -overwrite
 
-# Copy fields after meshing to avoind the generation of unnecessary patch fields
+# Copy fields after meshing to avoid the generation of unnecessary patch fields
 restore0Dir
 
 # Initialize alpha
@@ -28,7 +25,7 @@ runApplication -s main \
     decomposePar -force
 
 # Run
-runParallel $application
+runParallel $(getApplication)
 
 # Reconstruct
 runApplication reconstructPar -noFunctionObjects