Ajax suggestions:

Ajax suggestions:
* check in a new ajax suggestion engine (mwsuggest.js) which uses
  OpenSearch to fetch results (by default via API), this should
  deprecated the old ajaxsearch thingy
* extend PrefixSearchBackend hook to accept multiple namespaces for
  future lucene use (default implementation however can still
  process only one)
* Added to preferences, also a feature to turn it on/off for every
  input (disabled atm until I work out browser issues completely)
* WMF wikis probably won't be using API to fetch results, but a
  custom php wrapper that just forwards the request to appropriate
  lucene daemon, added support for that

SpecialSearch:
* moved stuff out of SpecialSearch to SearchEngine, like snippet
  highlighting and such
* support for additional interwiki results, e.g. title matches
  from other projects shown in a separate box on the right
* todo: interwiki box doesn't have standard prev/next links to
  avoid clutter and unintuitive interface
* support for related articles