[Bug-mit-scheme] imail: message shouldn't retain deleted flag when filed

[Julie Sussman]

I think the Deleted flag should be treated like the Recent
flag when filing a message.  That is, it should not be flagged
as Recent or Deleted in its new home.

The situation arises if you delete a message but haven't
expunged it yet.  You then realize you wanted to write it
to another folder, so you do so.  But that copy of the
message -- in that other folder -- is marked as Deleted!

This can't be the Right Thing!

Thanks,
Julie