Bug 6149 - Stopwords for Result Highlighting

Bug 6149 - Stopwords for Result Highlighting

This patch adds a system preference to control stopwords used to
prevent operators and other 'minor' words from being highlighted
in search results when the OpacHighlightWords syspref is enabled

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>

Works as advertised, I fixed the updatedatabase to use XXX so it won't
clash as much

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Fixed a conflict in updatedatabase.pl.
Also fixed tabs in opac-detail.tt

Feature passes all tests and QA script now.
Tested in intranet and OPAC with different words and searches.
Works on results pages and OPAC detail page.
Highlighting and unhighlighting still works correctly.

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Passes all tests and QA script, works as expected.