[Nutch Wiki] Update of "bin/nutch generate" by JulienNioche

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The "bin/nutch generate" page has been changed by JulienNioche:
https://wiki.apache.org/nutch/bin/nutch%20generate?action=diff&rev1=3&rev2=4

  Generate is an alias for org.apache.nutch.crawl.Generator
  
  This class generates a subset of a crawl db to fetch. This version allows us to generate fetchlists for several segments in one go. Unlike in the initial version (FetchListTool), the IP resolution is done ONLY on the entries which have been selected for fetching. The URLs are partitioned by IP, domain or host within a segment. We can chose separately how to count the URLS i.e. by domain or host to limit the entries.
+ 
+ Both versions return 0 if one or more segment have been generated, -1 on error and 1 if there aren't any URLs to put in a segment.
  
  === Nutch 1.x ===
  {{{