CONFIG: update completion_cache (for csh users)

- now consider options '-hostRoots', '-roots' to be advanced options
  that don't need to be in the cache

bin/tools/foamCreateCompletionCache

@@ -27,11 +27,12 @@ usage() {
 
 Usage: ${0##*/} [OPTION] [appName .. [appNameN]]
 options:
-  -d dir | -dir dir   Directory to process
-  -u | -user          Add \$FOAM_USER_APPBIN to the search directories
-  -no-header          Suppress header generation
-  -o FILE             Write to alternative output
-  -h | -help          Print the usage
+  -dir DIR          Directory to process
+  -user             Add \$FOAM_USER_APPBIN to the search directories
+  -no-header        Suppress header generation
+  -output FILE, -o FILE
+                    Write to alternative output
+  -h | -help        Print the usage
 
 Create cache of bash completion values for OpenFOAM applications.
 The cached values are typically used by the tcsh completion wrapper.
@@ -68,13 +69,13 @@ do
     -h | -help*)
         usage
         ;;
-    -d | -dir)
+    -dir)
         [ "$#" -ge 2 ] || die "'$1' option requires an argument"
         searchDirs="$2"
         [ -d "$searchDirs" ] || die "directory not found '$searchDirs'"
         shift
         ;;
-    -u | -user)
+    -user)
         searchDirs="$searchDirs $FOAM_USER_APPBIN"
         ;;
     -no-head*)
@@ -116,8 +117,8 @@ echo 1>&2
 # Header not disabled
 [ "$optHeader" = true ] && cat << HEADER
 #----------------------------------*-sh-*--------------------------------------
-# Cached options for bash completion of OpenFOAM applications, primarily for
-# use with the tcsh completion mechanism.
+# Cached options for bash completion of OpenFOAM applications,
+# primarily for use with the tcsh completion mechanism.
 # These are the values expected by the '_of_complete_' function
 #
 # Recreate with "${0##*/}"
@@ -140,7 +141,12 @@ HEADER
 #   -opt1         descrip
 #   -opt2 <arg>   descrip
 #   -help-full
-# Ignore -help-man (internal option).
+#
+# Ignores
+#   -help-man     Internal option
+#   -hostRoots    Advanced distributed run option
+#   -roots        Advanced distributed run option
+#
 # Terminate parsing on first appearance of -help-full.
 # - options with '=' (eg, -mode=ugo) are not handled very well at all.
 # - alternatives (eg, -a, -all) are not handled nicely either,
@@ -150,6 +156,7 @@ extractOptions()
     local appName="$1"
     local helpText=$($appName -help-full 2>/dev/null | \
         sed -ne 's/^ *//; /^$/d; /^[^-]/d; /^--/d; /^-help-man/d;' \
+            -e '/^-hostRoots /d; /^-roots /d;' \
             -e 'y/,/ /; s/=.*$/=/;' \
             -e '/^-[^ ]* </{ s/^\(-[^ ]* <\).*$/\1/; p; d }' \
             -e 's/^\(-[^ ]*\).*$/\1/; p; /^-help-full/q;' \