Attached is a change set with a number of improvements to Celeste.  I
think they make it easier to use, and more robust to failures.  I have
incorporated lex's feedback and erred on the side of safety.

I've tested this and have been using it with my personal email for the
last week or so.

Enjoy!

Mike
	mdr at scn.org


____
Change Set:		CelesteImprov-mdr
Date:			28 January 2000
Author:			Mike Rutenberg (mdr at scn.org)

A number of fixes and improvements to Celeste.

(1) Ensure the definitive email database is on disk over a snapshot, so
that database changes are reflected next time the image is started
	(a) Write database to disk before snapshot
	(b) Read database from disk when Celeste next receives modelWakeUp

(2) Add Balloon Help for buttons and Celeste specific menus

(3) Check database integrity when opening by ensuring the modification
times of the files corresponds to the saveDB save order

(4) Remove a redundant (and costly) self changed: message from
updateTOC.  When displaying a new/modified large category (e.g. the 8000
Squeak messages of last year) it cuts the update time almost in half
from 14 seconds.


A variety of smaller fixes including:

(5) MailAddressTokenizer would go into an infinite loop when evaluating
email addresses containing accidental control character white space. 
Change the value of class variable CSNonSeparators to handle this. 
(e.g. MailAddressParser addressesIn: (22 asCharacter asString,
'testuser at host.com'))

(6) Fix From filter and Subject filter buttons to correctly display
their state when you decide to cancel entering a new filter

(7) Saving mail now gives visual feedback

(8) Move Again button fixed to operate gracefully when no message is
selected

(9) Minor support changes to rest of system
	Defines View|setBalloonText: aString for morphic compatibility for
Buttons
	Cosmetic chage to an error message in FileDirectory
	Change to ensure modelWakeUp is sent to the active window after
Snapshot-and-continue

(10) Automatic saves of the database following network communication is
now controlled by an flag and have been moved slightly to ensure that
slow writing will not time-out network connections.  Default behaviour
is to do save, as previously.
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