squashed trailing space problem with section titles; allowing numbers in links

ldoc/doc.lua

@@ -346,7 +346,7 @@ end
 -- is not empty.
 
 function File:add_document_section(title)
-   local section = title:gsub('%A','_')
+   local section = title:gsub('%W','_')
    self:new_item {
       name = section,
       class = 'section',

ldoc/html.lua

@@ -122,7 +122,10 @@ function html.generate_output(ldoc, args, project)
       else return name end
    end
 
-   function ldoc.no_spaces(s) return (s:gsub('%A','_')) end
+   function ldoc.no_spaces(s)
+      s = s:gsub('%s*$','')
+      return (s:gsub('%W','_'))
+   end
 
    function ldoc.titlecase(s)
       return (s:gsub('(%a)(%a*)',function(f,r)