Prevent the spurious generation of newlines at the end of :lines

textareas.

(This may be a bit of a hack.  It appears that #in directives handle
newline whitespace differently than #if - #if seems to ignore it!  To
account for this i used a literal '\n' string, to be included after
every but the last value.)

lib/python/OFS/properties.dtml

@@ -61,8 +61,8 @@ values and click "Save Changes".
    "getProperty(id)"--></textarea>
   <!--#elif "type=='lines'"-->
   <textarea name="<!--#var id-->:lines" rows="6" cols="35"><!--#in
-  "getProperty(id)"--><!--#var sequence-item-->
-<!--#endin--></textarea>
+  "getProperty(id)"--><!--#var sequence-item--><!--#if
+   sequence-end--><!--#else--><!--#var "'\n'"--><!--#/if--><!--#endin--></textarea>
   <!--#elif "type=='selection'"-->
     <!--#if "_.has_key(select_variable)"-->
     <select name="<!--#var id-->">