[imp] Display of folders from Cyrus IMAPD

[Aleksandar Milivojevic]

In the old versions of IMP (4.0.x and older), IMP was displaying the  
folders from my Cyrus servers like:

INBOX
     Subfolder1
     Subfolder2
Shared folder

Which is the way folders exist on IMAP server, the way they are  
reported by IMAP server, and the way every mail client in known  
universe (that I've been using so far) displays them.

IMP 4.1 attempts to be "smart" and autodetect things.  And as soon as  
it smells Cyrus on the other side it starts displaying my folders as:

INBOX
Subfolder1
Subfolder2
Shared folder

Basically same braindamaged thing as when setting "namespace" option  
to 'INBOX.' in older versions of IMP.

This is extremely confusing.  My folders appear at the same level as  
the shared folders...  If one of my folders has same name as one of  
the shared folders, there's no way to tell which is which in IMP 4.1.   
Any way to get old behaviour back?  I do want to see my folders as  
subfolders of INBOX (the way they exist on my IMAP server).

I've tried mocking with namespace option, but couldn't get things to work.

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