[plt-scheme] A few bugs

All the following bugs occured under Windows XP Pro, with DrScheme 205:
1. The contour does not always update correctly, it sometimes leaves deleted characfers untouched.
2. The Insert Large Letters... menu item works okay only if you add a few spaces at the end of the string; otherwise the end of the last letter gets cut off. Also, it should use the same font as the editor, and should be made of those letters (for instance an e should be a bunce of e's) for better readablity outside the contour
3. Cancelling word wrapping in the options (edit -> preferences -> editing -> general -> wrap words in editor buffers) has no affect, it still wraps.
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