merges r20625, r20633, r20656 and r20665 from trunk into ruby_1_9_1.

--
* encoding.c (enc_set_default_encoding): allowed to set default
  encoding.
--
* encoding.c (rb_enc_aliases_enc_i): skips default internal.
--
* encoding.c (enc_get_default_encoding): removed.
  Generalizing rb_default_{external,internal}_encoding seems to be
  difficult.
  default_external cannot be NULL even before detected. [ruby-dev:37390]

* encoding.c (rb_default_external_encoding): has its own
  implementation again.

* encoding.c (rb_default_internal_encoding): ditto.

* gem_prelude.rb: added notice.

* ruby.c (rubylib_mangled_path, rubylib_mangled_path2): uses locale
  encoding but not ASCII-8BIT.

* ruby.c (process_options): refers less to default_external.
--
* encoding.c (rb_enc_set_default_external): default_internal can be
  nil, but default_external cannot.

* encoding.c (rb_set_default_internal): adds rdoc.

* encoding.c (enc_find): ditto.

git-svn-id: http://svn.ruby-lang.org/repos/ruby/branches/ruby_1_9_1@20698 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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