1. Limit the number of file names displayed in the MRU menu.
2. Provide a configuration variable for selecting the number
of file names displayed in the MRU menu or in the sub-menu.
3. Add a menu accelerator for the Recent Files menu.
4. Add the ":Mru" command (alias for the ":MRU" command) for ease of use.
5. When a file not present in the MRU list is supplied to
the ":Mru" command, then open the file.
6. Add 'v' command to edit a file from the MRU list as read-only.
7. Increase the default MRU list size to 100 from 10.
8. Support for opening multiple files from the MRU list.