[dovecot] v0.97 released

[Timo Sirainen]

This is a major cleanup release. My near future goal is to make it
impossible to crash Dovecot no matter what you did. This release also adds
support for files larger than 2GB with Linux and Solaris. Also mbox support
seems to work quite well now, except EXPUNGE and STORE are still not
implemented.

The "impossible to crash" should already be quite true, at least when it
comes to index files. You can try to corrupt indexes in any way you want,
and Dovecot should not crash. There's one exception to this: modifying the
files while dovecot is reading them may crash it, this is too difficult to
fix as long as shared memory maps are used, and I don't see much point in it
anyway. I mostly want dovecot to survive corrupted files, not intentional
crashing :)

This release is the first I'd almost like to call beta-quality. But not
quite. It still lacks testing and several features, but it's very close :)

Changelog:

v0.97 2002-08-29  Timo Sirainen <tss at iki.fi>

	+ Large mails are handled in 256kB blocks, so mail size no longer
	  has hardly any effect on memory usage
	+ 64bit file offsets are used if supported by system. This means
	  Dovecot is fully capable of handling >2G mails in those systems.
	  With 32bit offsets >2G mails may not behave too well, but should
	  not crash either.
	+ I fixed lots of potential integer overflows. This should make us
	  fully crash-free no matter what happens (index file corruption
	  mostly). I didn't verify everything too carefully yet, so more
	  auditing is still needed before we fully reach that goal.
	+ Implemented several missing tasks / optimizations to index handling.
	  It should now stay fast after longer usage periods.
	+ New configuration file options: log_path, log_timestamp, imaps_listen
	+ "Critical errors" are now hidden from users, ie. any error message
	  that is not a direct reply to user error is written into log file
	  and user gets only "Internal error [timestamp]".
	+ Nonblocking SSL handshaking
	+ Lots of code cleanups
	- Lots of mbox fixes, it seems to be somewhat reliable now
	- Year in Date-field was parsed wrong
	- Appending mail to mbox didn't work right
	- Always verify that mailbox names are valid (especially they shouldn't
	  contain "../")