bug#5952: 23.1.95; Some new ido features on top of virtual buffers

[Leo Liu]

On 2010-04-15 18:54 +0800, Leo wrote:
> 1. make it possible to toggle the use of virtual buffers. Bind the
>    command to C-o when switching buffer (o for 'old' buffers).
>
> 2. handle files with same base names by appending one level of parent
>    directory. Some files may still be ignored but the chance is much
>    slimmer.
>
> 3. automatically bring in virtual buffers when user input doesn't match
>    existing ones.

Update: item 1 and 3 are done.

Leo