Merge from trunk.

* NEWS: Mention ipaddr enhancements.

* lib/ipaddr.rb (in_addr, in6_addr, addr_mask): Make some minor
  code optimization.

* lib/ipaddr.rb (<=>): Implement IPAddr#<=> and make IPAddr
  comparable.

* lib/ipaddr.rb (succ): Implement IPAddr#succ.  You can now create
  a range between two IPAddr's, which (Range) object is
  enumerable.

* lib/ipaddr.rb (to_range): A new method to create a Range object
  for the (network) address.

* lib/ipaddr.rb (coerce_other): Support type coercion and make &,
  |, == and include? accept a string or an integer instead of an
  IPAddr object as the argument.

* lib/ipaddr.rb (initialize): Give better error messages.

* lib/ipaddr.rb: Improve documentation.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@13710 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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