ENH: print paraFoam -help and -help-full to stdout

- this makes it possible to use "foamAddCompletion paraFoam" and have
  bash completions for paraFoam as well

bin/paraFoam

@@ -4,37 +4,24 @@
 # \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
 #  \\    /   O peration     |
 #   \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
-#    \\/     M anipulation  | Copyright (C) 2016 OpenCFD Ltd.
+#    \\/     M anipulation  | Copyright (C) 2016-2017 OpenCFD Ltd.
 #-------------------------------------------------------------------------------
 # License
-#     This file is part of OpenFOAM.
-#
-#     OpenFOAM is free software: you can redistribute it and/or modify it
-#     under the terms of the GNU General Public License as published by
-#     the Free Software Foundation, either version 3 of the License, or
-#     (at your option) any later version.
-#
-#     OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
-#     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-#     FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
-#     for more details.
-#
-#     You should have received a copy of the GNU General Public License
-#     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+#     This file is part of OpenFOAM, licensed under GNU General Public License
+#     <http://www.gnu.org/licenses/>.
 #
 # Script
 #     paraFoam
 #
 # Description
-#     Start paraview with the OpenFOAM libraries and reader modules.
+#     Start paraview with OpenFOAM libraries and reader modules.
 #
 # Note
-#     Combining -block or -builtin options with -region option yields
+#     Combining -block, -vtk, -builtin options with -region option yields
 #     undefined behaviour
 #------------------------------------------------------------------------------
-usage() {
-    exec 1>&2
-    while [ "$#" -ge 1 ]; do echo "$1"; shift; done
+printHelp() {
+    # Print usage to stdout so that it can be captured for bash completion
     cat<<USAGE
 
 Usage: ${0##*/} [OPTION] [--] [PARAVIEW_OPTION]
@@ -47,7 +34,7 @@ options:
                     create .blockMesh, .foam, .OpenFOAM files (for all regions)
   -touch-proc       same as '-touch' but for each processor
   -vtk | -builtin   use VTK builtin OpenFOAM reader (uses .foam extension)
-  -help             print the usage
+  -help |-help-full print the usage
   --help            paraview help
 
 Start paraview with the OpenFOAM libraries and reader modules.
@@ -56,7 +43,7 @@ Note that paraview options begin with double dashes.
   paraview=$(command -v paraview)
 
 USAGE
-    exit 1
+    exit 0  # A clean exit
 }
 
 # Report error and exit
@@ -91,8 +78,8 @@ unset regionName optTouch
 while [ "$#" -gt 0 ]
 do
     case "$1" in
-    -h | -help*)
-        usage
+    -h | -help-*)
+        printHelp
         ;;
     -block*)
         extension=blockMesh