Sync with Tramp upstream.

Sync with Tramp upstream.

* net/tramp-cache.el (tramp-dump-connection-properties):
Use `with-temp-file'.

* net/tramp-sh.el (tramp-perl-file-attributes)
(tramp-perl-directory-files-and-attributes): Escape apostrophs in
file names.
(tramp-do-file-attributes-with-stat): Quote file name.
(tramp-sh-handle-directory-files-and-attributes): Fall back to
`tramp-handle-directory-files-and-attributes' in case of problems.
(tramp-do-directory-files-and-attributes-with-stat)
(tramp-sh-handle-file-name-all-completions)
(tramp-sh-handle-delete-directory)
(tramp-sh-handle-expand-file-name, tramp-sh-handle-process-file):
Normalize use of "cd".
(tramp-do-directory-files-and-attributes-with-stat): Use the
`quoting-style' arg of `ls' if possible.  Make it also working for
file names with apostrophs.
(tramp-sh-handle-file-name-all-completions): Use arguments of `ls'
in proper order.
(tramp-do-copy-or-rename-file-via-buffer)
(tramp-sh-handle-file-local-copy): Use `with-temp-file'.
(tramp-get-remote-locale): Accept also \r in output.
(tramp-get-ls-command-with-quoting-style): New defun.
(tramp-get-inline-coding): Set `default-directory' to a local
directory.  Sporadically, `call-process-region' does not handle a
remote default directory properly.

* net/tramp.el (tramp): Add :link property.
(tramp-login-prompt-regexp): Allow also "user", as required by
Fritz!Box telnet.
(tramp-autoload-file-name-handler): Use "/".
(tramp-handle-unhandled-file-name-directory): Return nil when
required by the spec.

* net/trampver.el: Update release number.