* Implement `save-buffers-kill-edwin' which kills Edwin and returns to

* Implement `save-buffers-kill-edwin' which kills Edwin and returns to
Scheme.  This is bound to C-x c in fundamental mode.

* Change `unmap-alias-char' to leave the following characters
unchanged: tab, linefeed, page, return, altmode.  This compensates for
the previous change to `ascii-controlified?'.

* Implement `editor-frame-windows' which returns all of the
buffer-frames which are inferiors of an editor-frame.

* Implement `all-screens', `all-editor-frames', and `all-windows',
which return lists of all of the respective objects.

* The procedure `(window-redraw! window redraw-type)' has been
changed.  Now, it delays the actual work until update time, and
`redraw-type' can be one of:

value			meaning
-----			-------
'START			preserve the start position of the window
'POINT			preserve the point position of the window
'BUFFER-CURSOR-Y	move point to last known position, or recenter
y			move point to the y'th row
other			center the point vertically in the window

* Implementation of `truncate-lines' functionality.  The following
changes are in support of this:

* Implementation of editor variable "assignment daemons" which allow
some arbitrary code to be executed whenever a specific variable is
assigned.

* Significant overhaul of local-variable binding:

** Implementation of "per-buffer" variables; that is, variables which
become buffer-local whenever they are set.  The new special form
`define-variable-per-buffer' supports this functionality.  The
following variables are defined as "per-buffer":

	fill-column
	left-margin
	tab-width
	case-fold-search
	truncate-lines

** Implementation of new operations to access the local and default
value of a variable:

	(variable-local-value? buffer variable)
	(variable-local-value buffer variable)
	(set-variable-local-value! buffer variable value)
	(variable-default-value variable)
	(set-variable-default-value! variable value)