Marshal.dump uses it to dump object.  unlike '_dump',
  marshal_dump returns any kind of object.

* marshal.c (r_object0): restore instance by calling
  'marshal_load' method.  unlike '_load', it's an instance
  method, to handle cyclic reference.

* marshal.c (marshal_load): all objects read from file should be
  tainted. [ruby-core:01325]

* lib/timeout.rb (Timeout::timeout): execute immediately if sec is
  zero.

* ext/socket/socket.c (socks_init): typo fixed. [ruby-talk:77232]

* ext/socket/extconf.rb: the default value for --enable-socks is
  taken from ENV["SOCKS_SERVER"]. [ruby-talk:77232]

* ruby.c (proc_options): add -W option. -W0 to shut up all warning
  messages. [ruby-talk:77227]

* error.c (rb_warn): no message will be printed if the value of
  $VERBOSE is "nil", i.e. perfect silence.

* ruby.c (verbose_setter): $VERBOSE value is either true, false,
  or nil.

* io.c (Init_IO): no "read" check for $stdin.  in addition some
  function names has been changed.

* regex.c (re_match_exec): incorrect multibyte match.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@4220 b2dd03c8-39d4-4d8f-98ff-823fe69b080e