mason/dhandler: Make `.breadcrumbs' be a filter.

Then we can put options near the end.

diff --git a/mason/dhandler b/mason/dhandler
index 6a81e78..f523432 100755 (executable)
--- a/mason/dhandler
+++ b/mason/dhandler
@@ -265,6 +265,10 @@ Failed to find &lsquo;<% $path |h %>&rsquo;.
 %   }
 <% $prev %>\
 % }
+% if ($m->has_content) {
+
+<% $m->content %>\
+% }
 </h1>
 <%args>
        $what