[VM] buffer-modified flags

[Uday Reddy]

Over time, the buffer-modified flags of VM (the "*" or "**" indicators 
on the modeline that say whether a buffer has been modified) have become 
chaotic.

It seems to me that the only modifications that matter are the 
modifications to the folder.  And, that information should be shown in 
both the Summary and Presentation buffers.  In other words, the  Summary 
and Presentation buffers shouldn't maintain their own buffer-modified flags.

What do you think?

Cheers,
Uday