Poke :downloads a bit. Add -sort flag, downloadsort option, :dlclear command. Closes issue #386.

--HG--
extra : rebase_source : 1ce7621d39e91f2779d1827975b44f00c7a1d00b

common/locale/en-US/messages.properties

@@ -257,6 +257,9 @@ quickmark.added-2 = Added Quick Mark '%S': %S
 
 save.invalidDestination-1 = Invalid destination: %S
 
+sort.ascending  = ascending
+sort.descending = descending
+
 status.link-1 = Link: %S
 
 style.none = No style found