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New system release

System 45.2 with microcode 692 is now available.  Currently it is only on CADR-6
but it will migrate to other machines soon.  This system fixes several serious
bugs in 44.3.  Note that system 45.2 does not have ZMAIL in it; a 45.3 with
ZMAIL should come out in a day or two.

The following changes may be of interest:

A new special form, WITH-OPEN-FILE.  This should be used in most cases
rather than calling OPEN, since it arranges for proper cleanup upon
abnormal exit.
	(WITH-OPEN-FILE (var filename options)
		body2 ... )
evaluates the forms body1, body2, ... with var bound to a stream
which is the result of (OPEN filename options).  The stream is
closed after evaluating the body.  The stream is also closed if
control is thrown out of the body, and in this case if if the file
is being written the partially-written file is deleted.

New hash-table facility available.  Documentation is in a section
of the file AI:LMMAN;FD.CON >.

If you don't know about the WITH-INPUT-FROM-STRING and WITH-OUTPUT-TO-STRING
special forms, documentation may be found in the file AI:LMMAN;FD.STR >.

Some serious bugs in the process system have been fixed.  The most
noticeable was that the Abort key did not run unwind-protects!

The usual large number of small bug fixes, especially to file names,
processes, and typeahead.

The special characters that represent function keys now display with their
new-keyboard names.  The page-separator now displays as <PAGE> rather than
<FORM>.  Typing TERMINAL/HELP will give a better display with documentation
on all the function keys on the new keyboard (even if you're on an old keyboard!).

A couple things have been renamed; probably few people were using them.
If you added anything to TV:WINDOW-TYPES-ITEM-LIST you should
add it to TV:DEFAULT-WINDOW-TYPES-ITEM-LIST instead; the reason is
that this list can be per-screen and per-frame now.  The :STATUS
message returns a new value, :EXPOSED-IN-SUPERIOR.