Goals for next minor release (0.3.1):
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* Finish docbook sgml documentation & man page

Goals for next major release (0.4.0):
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* Lock any original .gz files 
  - is this necessary?
* Check for symlink attacks for tempfiles (although we don't use /var/tmp)

Longer Term goals:
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* Use zlib instead of calling gzip directly
* Add MMDF mailbox support
* Add Babyl mailbox support
* Add option to archive depending on mailbox size threshold 
  - is this a good idea?
* Add option to archive depending on number of messages
  - is this a good idea?
* Test for missing compression programs 
  - is this a waste of time?
* Add option - do not compress 
  - is this useless?
* Use a Makefile/python installation process