Improve bash_completion for patches in MQ

contrib/bash_completion

@@ -288,7 +288,7 b' complete -o bashdefault -o default -F _h'
 
 _hg_cmd_qdelete()
 {
-    _hg_ext_mq_patchlist qseries
+    _hg_ext_mq_patchlist qunapplied
 }
 
 _hg_cmd_qsave()
@@ -313,6 +313,11 b' complete -o bashdefault -o default -F _h'
     COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$files' -- "$cur"))
 }
 
+_hg_cmd_export()
+{
+    _hg_ext_mq_patchlist qapplied
+}
+
 
 # hbisect
 _hg_cmd_bisect()