Doxygen: Updated scripts and css files to process OpenFOAM header files more robustly

and generate cleaner HTML files.
Thanks to Bruno Santos for various fixes and improvements.
Resolves bug reports:
    http://www.openfoam.org/mantisbt/view.php?id=1516
    http://www.openfoam.org/mantisbt/view.php?id=1016
    http://www.openfoam.org/mantisbt/view.php?id=1512

bin/tools/doxyFilter

@@ -1,11 +1,11 @@
-#!/bin/sh
+#!/bin/bash
 #------------------------------------------------------------------------------
 # =========                 |
 # \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
 #  \\    /   O peration     |
-#   \\  /    A nd           | Copyright (C) 2011 OpenFOAM Foundation
+#   \\  /    A nd           | Copyright (C) 2011-2015 OpenFOAM Foundation
 #    \\/     M anipulation  |
-#-------------------------------------------------------------------------------
+#------------------------------------------------------------------------------
 # License
 #     This file is part of OpenFOAM.
 #
@@ -38,7 +38,15 @@
 
 if [ "$#" -gt 0 ]
 then
-    filePath=$(echo $1 | sed -e s@^$WM_PROJECT_DIR@../../..@ )
+
+    realFilePath=$(echo $1 | sed -e s@^$WM_PROJECT_DIR@../../..@ )
+    if [ -n "$FOAM_ONLINE_REPO" ]
+    then
+        filePath=$(echo $1 | sed -e s@^$WM_PROJECT_DIR@$FOAM_ONLINE_REPO@ )
+    else
+        filePath=$realFilePath
+    fi
+
     # dirName=$(echo "$filePath" | sed -e 's@/[^/]*$@@' )
     dirName=${filePath%/[^/]*}
     fileName=${filePath##*/}
@@ -57,6 +65,7 @@ then
     awk -f $WM_PROJECT_DIR/bin/tools/doxyFilter-table.awk $1 | \
     awk -f $awkScript  | \
     sed -f $WM_PROJECT_DIR/bin/tools/doxyFilter.sed \
+        -e s@%realFilePath%@$realFilePath@g \
         -e s@%filePath%@$filePath@g \
         -e s@%fileName%@$fileName@g \
         -e s@%dirName%@$dirName@g