* lib/getopts.rb: Merge from 1.7. Rewrite to fix some bugs and

  complete features.
    - Accept options with the colon in the first argument;
      getopts("a:bcd:") is equivalent to getopts("bc", "a:", "d:").
    - Do not discard the argument that caused an error.
    - Do not discard '-', which commonly stands for stdin or stdout.
    - Allow specifying a long option with a value using '='.
      (command --long-option=value)
    - Stop reading options when it meets a non-option argument.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_6@2190 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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