STYLE: remove unnecessary stdout, stderr /dev/null redirects

- no stderr redirect needed:
    * 'command -v'

- no stdout/stderr redirect needed:
    * 'rm -f'

STYLE: consistent spacing after redirects

tutorials/verificationAndValidation/turbulentInflow/Allclean

@@ -4,7 +4,7 @@ cd ${0%/*} || exit 1                                # Run from this directory
 #------------------------------------------------------------------------------
 
 cleanCase0
-\rm -rf constant/boundaryData/inlet 2>/dev/null
-\rm -rf results 2>/dev/null
+rm -rf constant/boundaryData/inlet
+rm -rf results
 
 #------------------------------------------------------------------------------

tutorials/verificationAndValidation/turbulentInflow/Allrun

@@ -28,7 +28,7 @@ do
     mv -f log.* *.png postProcessing "$results" 2>/dev/null
 
     cleanTimeDirectories
-    \rm -rf processor* >/dev/null 2>&1
+    rm -rf processor*
 done
 
 #------------------------------------------------------------------------------

tutorials/verificationAndValidation/turbulentInflow/Allrun-parallel

@@ -29,7 +29,7 @@ do
     mv -f log.* *.png postProcessing "$results" 2>/dev/null
 
     cleanTimeDirectories
-    \rm -rf processor* >/dev/null 2>&1
+    rm -rf processor*
 done
 
 #------------------------------------------------------------------------------

tutorials/verificationAndValidation/turbulentInflow/createGraphs

@@ -2,7 +2,7 @@
 cd ${0%/*} || exit 1                        # Run from this directory
 
 # Require gnuplot
-command -v gnuplot >/dev/null 2>&1 || {
+command -v gnuplot >/dev/null || {
     echo "gnuplot not found - skipping graph creation" 1>&2
     exit 1
 }