our last version was 0.84).
* Update documentation.
* Move Bayes stuff into its own file.
* Fix NaN exception: if list is empty, use zero for probability.
* Make extrema array (keepers) variable size. Needs more work.
* Add SYSLIBS to the makefile.
* Fix gcc-ism in dbg.c (ptr arithmetic on void*).
* Fix off-by-one in html tag check.
* Fix unaligned access in libdb.
* Fix bug in -d handling for text and libdb.
* Autodetect mailbox type and deprecate the -m option.
* Ditch the builtin libdb locks, use fcntl instead.
* Fix memory leak in dbtext.
* Fix some trivial issues with the lexer:
- Be more strict about recognizing IP addresses.
- Do case-insensitive header name comparisons.
* Fix multiple database closure with mbox format.
* Fix a bogus assert in passthrough.
* Add heap checking in debug mode.
* Fix bug in -N mode which made it act the same as -S.
* Support maildir style folders.
* Fix bug in multiple message registration.
* Improve error reporting and clarify some messages.
* Package preformatted manpage instead of XML.
* Remove single message per invocation restriction.
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