Revision 169512

Logic ignored stop words were in a early version of this code but it was taken out in the belief that there
was no point in explicitly looking for them as the scoring algorithm would effictively ignore them.

I did a test and indexed 700 pages on a corporate web site and then ran the MoreLikeThis code on them
and 1/2 of the docs had stop words identified as interesting.

So - I added code in to ignore stop words, but make it backward compatible so that by default this code
is not used.