Try to make some sense out of the mess that used to be INSTALL.TXT.

1. Bring floppies.sgml section in-line into install.sgml, where it

makes more sense.

2. Slightly reorganize some sections of Installation section and

do some wordsmithing.

3. Update distribution layout to reflect RELNOTESng and new compat

distributions.

4. Update upgrade file list from 4-STABLE.

5. It's been a long time since 2.2.X; get rid of instructions dealing

with "new" handling of compatability slices and fix up other references
in the text.

6. Hunt down and kill emoticons with extreme prejudice. Try to

tone down the use of exclamation points.

7. Cross-reference new and improved Installation chapter in

Handbook.

8. Add a proper abstract for this document.