Sync with Tramp 2.1.19.

Sync with Tramp 2.1.19.

* tramp.texi (Inline methods, Default Method): Mention
`tramp-inline-compress-start-size'.  Remove "kludgy" phrase.  Remove
remark about doubled "-t" argument.
(Auto-save and Backup): Remove reference to Emacs 21.
(Filename Syntax): Describe port numbers.
(Frequently Asked Questions): Adapt supported (X)Emacs versions.  Adapt
supported MS Windows versions.  Remove obsolete URL.  Recommend "sshx"
and "scpx" for echoing shells.  Use the $() syntax, texi2dvi reports
errors with the backquotes.
(External packages): File attributes cache flushing for asynchronous
processes.
(Traces and Profiles): Describe verbose level 9.

* trampver.texi: Update release number.