Show/set buffer attributes

  The Buffer Attributes dialog box contains the following:-

                o  Buffer-A text box holding the name of the buffer (by
                   default the current buffer) for which the settings are
                   shown and for which the settings can be modified. The
                   associated Select... button will bring up a selection
                   dialog box which will display all the buffers for the
                   current LSE session.

                o  Output File-A text box holding the output filename,
                   if any for the buffer. The associated Select... button
                   will bring up the standard file selection widget.

                o  Language-A text box holding the current language
                   for the buffer (NONE if there is no language). The
                   associated Select... button will bring up a selection
                   dialog box containing all the defined languages and
                   NONE.

                o  Left Margin-A text box holding the left margin.

                o  Right Margin-A text box holding the right margin.

                o  Tab Increment-A text box holding the logical tab stop
                   length.

                o  Max Undo-A text box holding the maximum number of
                   commands that can be undone.

                o  Read Only / Write-A group of radio buttons to allow the
                   user to choose between WRITE or READ-ONLY.

                o  Unmodifiable / Insert / Overstrike-A group of radio
                   buttons to choose between UNMODIFIABLE, INSERT
                   and OVERSTRIKE. If the buffer is READ-ONLY, then
                   UNMODIFIABLE will be set on by default. When the buffer
                   is set to WRITE, UNMODIFIABLE will be disabled.

                o  Auto Erase-A toggle button which enables or disables
                   automatic erasing of placeholders.

                o  Journaling-A toggle button which enables or disables
                   buffer-change journaling.

                o  Wrap-A toggle button which enables or disables line
                   wrapping.

                o  Overview- A toggle button which enables or disables
                   overview operations.

                o  Forward / Reverse-A group of radio buttons to allow the
                   user to set the direction of the buffer to FORWARD or
                   REVERSE.