on tk8.5, make top pane enlarge by default
on tk8.5, make top pane enlarge by default

Before the addition of the pane, the top part would enlarge and the
program text would stay fixed-size when the window was enlarged.  After
the addition of this patch, the text enlarges.  Tk8.4 (Ubuntu hardy)
offers no control over this, but Tk8.5 (Ubuntu karmic) does through
"paneconfigure -stretch".  When this feature is available, restore
the old behavior of enlarging the preview area by default, keeping
the program text fixed-size.

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