* net/tramp.el (tramp-local-host-regexp)

* net/tramp.el (tramp-local-host-regexp)
(tramp-prefix-domain-format)
(tramp-prefix-domain-regexp, tramp-domain-regexp)
(tramp-user-with-domain-regexp, tramp-prefix-ipv6-format)
(tramp-prefix-ipv6-regexp, tramp-ipv6-regexp)
(tramp-postfix-ipv6-format, tramp-postfix-ipv6-regexp): New
defconst.
(tramp-file-name-structure, tramp-file-name-regexp-unified)
(tramp-completion-dissect-file-name, tramp-parse-hosts-group)
(tramp-dissect-file-name, tramp-make-tramp-file-name)
(tramp-completion-make-tramp-file-name): Handle IPv6 addresses.
(tramp-handle-insert-file-contents): Fix setting of
`buffer-read-only'.
(tramp-compute-multi-hops, tramp-local-host-p): Use
`tramp-local-host-regexp'.
(tramp-file-name-real-user, tramp-file-name-domain): Use
`tramp-user-with-domain-regexp'.