I finally got the time to put together some stuff for fti for

I finally got the time to put together some stuff for fti for
inclusion in pgsql. I have included a README which should be enough
to start using it, plus a BENCH file that describes some timings
I have done.

Please have a look at it, and if you think everything is OK, I
would like it seen included in the contrib-section of pgsql.

I don't think I will do any more work in this, but maybe it inspires
somebody else to improve on it.

Maarten Boekhold