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[plt-scheme] 200alpha21

The exp-tagged code in CVS for MzScheme and MrEd is now version

This version provides Mac OS improvements. It doesn't look much better
than 200alpha20 --- there are still many significant "surface" problems
--- but it shouldn't crash anymore in OS X. For Mac OS Classic, MrEd
builds with MPW and mostly works, but stand-alone MzScheme is no longer
supported for Classic.


 * `send-event' (for sending AppleEvents) is now in MrEd instead of

    The new "sendevent.ss" MzLib library exports a `send-event'
    procedure for programs that need to sometimes run in MzScheme.
    Currently, MzLib's `send-event' works only when run within MrEd. In
    a future version, `send-event' may work in OS X by calling out to