#16 Add smooth vertical scrolling

[Christopher Nelson]

Add smooth vertical scrolling to tables. Changes for
horizontal scrolling should be orthogonal and I may get
to them, but not right away.

There are two remaining issues:

- When smooth scrolling, the top of an image which is
vertically centered in its cell gets clipped.

- When scrolling by line, the last bit of the last row
doesn't always show.

I'm working on the latter. The former I could use some
help with.

[Christopher Nelson]

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Another try at the patch. This has been verified to apply
without errors and includes changes to tkTable.n

[Christopher Nelson]

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smoothScroll.tgz also removes line-at-a-time scroll mode
that didn't quite work. Now have just row and smooth.

[Christopher Nelson]

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Fix scroll bar thumb height. It used to bounce around, now
it properly reflects the amount of the table that's visible.

[Christopher Nelson]

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With this patch, selected cells are not highlighted when the
table is disabled.

[Christopher Nelson]

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Fixed the problem with selection not showing up. As it
turns out, TableDisplayBuildTags was using an empty array
index for hash lookups so a lot of tags wouldn't have been
found.

[Christopher Nelson]

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New patch built and tested on WinXP and W98.

[Christopher Nelson]

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I believe I've got the weird scrollbar behavior in hand for
Linux and 'Windows now.

[Christopher Nelson]

Fix scrollbar extremes on 'Windows and Linux