[Zope] FieldedTextIndex weighting implemented

[Casey Duncan]

I have an initial implementation of the per-field weighting checked into
cvs. I haven't released 0.2 yet, but I expect to sometime in the next
week or so. The new feature is unit-tested and documented in the README,
so feel free to check it out in the mean time.

You can download it directly from CVS at:

http://cvs.zope.org/Products/FieldedTextIndex/

There is a link to generate a tarball at the bottom, or you can check in
out using anonymous cvs if you want to track changes.

Let me know what you think.

-Casey