12.5.1 MH Objects 
MH instances have the following methods:
- error(format[, ...])
 - 
Print an error message - can be overridden.
 
- getprofile(key)
 - 
Return a profile entry (
None if not set).
 
- getpath()
 - 
Return the mailbox pathname.
 
- getcontext()
 - 
Return the current folder name.
 
- setcontext(name)
 - 
Set the current folder name.
 
- listfolders()
 - 
Return a list of top-level folders.
 
- listallfolders()
 - 
Return a list of all folders.
 
- listsubfolders(name)
 - 
Return a list of direct subfolders of the given folder.
 
- listallsubfolders(name)
 - 
Return a list of all subfolders of the given folder.
 
- makefolder(name)
 - 
Create a new folder.
 
- deletefolder(name)
 - 
Delete a folder - must have no subfolders.
 
- openfolder(name)
 - 
Return a new open folder object.
 
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