* array.c (rb_ary_flatten, rb_ary_flatten_bang): Take an optional

  argument that determines the level of recursion to flatten;
  backported from 1.9.

* array.c (rb_ary_shuffle_bang, rb_ary_shuffle, rb_ary_choice,
  rb_ary_cycle, rb_ary_permutation, rb_ary_combination,
  rb_ary_product, rb_ary_take, rb_ary_take_while, rb_ary_drop,
  rb_ary_drop_while): New methods: Array#shuffle, #shuffle!,
  #choice, #cycle, #permutation, #combination, #product, #take,
  #take_while, #drop, #drop_while; backported from 1.9.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@16016 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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