Refactoring of the mbox classes

The RetainMbox and ArchiveMbox classes are now gone, mainly because their
finalise() methods were messing with the archived mbox and the archive,
respectively, which was not good OO design.

The core functionality of the finalise() methods of both removed classes
is moved to the objects that are manipulated: the Mbox class representing
the mbox that is being archived gains a new method overwrite_with(), and
there is a new class ArchiveMbox that represents the actual archive, which
has an append() method (yes, unfortunately the new class has the same name
like the removed class).

The RetainMbox instance is replaced with a TempMbox, and the ArchiveMbox
instance either with a TempMbox, or a CompressedTempMbox if archive
compression is enabled.

Finally, a compressed TempMbox is now a implemented as a subclass of
TempMbox, named CompressedMbox.

Cooperation with the StaleFiles class moves into the TempMbox class.
This means slightly less detailed verbose cleanup reporting, oh well.

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