wclean all does not use Allwclean in subdirectories

reported as http://bugs.openfoam.org/view.php?id=2125

In lines 224-229 in wclean script, it is clear that using "wclean all" only uses the top-level Allwclean and will not actually recurse for Allwclean. Instead it goes for things with 'Make' directories and then issues a plain wclean for these. This means that any 'Allwclean' present there will not be used, ever.

As a minimal workaround:

    # For all the sub-directories containing a 'Make' directory
    for dir in `find . \( -type d -a -name Make \)`
    do
        dir=${dir%/Make} # Parent directory - trim /Make from the end
        echo $dir
        if [ -e "$dir/Allwclean" ]
        then
            $dir/Allwclean
        else
            $0 $dir
        fi
    done