[Nutch Wiki] Update of "Features" by LarsAronsson

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The following page has been changed by LarsAronsson:
http://wiki.apache.org/nutch/Features

The comment on the change is:
Features of Nutch search could be documented here, if I knew the answers.

New page:
Missing from the current Nutch documentation (Tutorial, FAQ) is a list of features. This wiki page could help, if someone who knows the answers can edit it.

 *What kind of searches does Nutch support? (quoted, nested, truncation, wildcarding [and where], Boolean),
 *Is stemming an option?
 *What kind of stemming does Nutch use? (and can you add exceptions/changes?)
 *Does Nutch support Boolean operators? (can you use Google-like plus or minus or are you stuck with 1990s terms?)
 *Does Nutch support weighted field searching, synonym support?
 *What kinds of indexes does Nutch build? (multi-format indexing, incremental indexing, spell-check support, thesauri support, fielded searching,  rank-by-reputation?)

 *How does the search engine handle punctuation and special characters? (and what's configurable?)
 *Which document formats are supported?
 *What post-coordination options are available? (hey Karen, what does this mean?)

 *How easy is Nutch to configure?
 *How transparent is its configuration to a working organization: does it require geeky command line stuff, or can a knowledgable manager enter a web or software interface to view or modify settings?

 * How are results sorted?
 * Does Nutch support deduping?
 * Can one tinker with relevance algoritms?
 * Are there ranking overrides?