Apparently no objections, so...

Some changes to make menubar and popup menus more consistent (but still some way to go):
* Menubar - Message has same "Mark Thread" submenu as popup
* All popups with "Print", "Save" and "Save Attachments" in consistent order
* Message window popup (when selected text) has same "Reply" menu as preview popup
* Menubar - Folder - Mailing List Management has "..."
* Folder list popup has "Empty" and "Delete" in consistent order