Sync with Tramp repository

Sync with Tramp repository

* doc/misc/tramp.texi (Configuration): Note, that Tramp must be
required prior changing its configuration.
(Connection caching, Predefined connection information)
(Remote shell setup): Fix typos.
(Predefined connection information): Describe, how to overwrite
parameters of `tramp-methods'.
(Remote programs, Remote processes, Traces and Profiles):
Simplify example.
(Remote programs): Remove superfluous comment.

* doc/misc/trampver.texi: Update release number.

* lisp/net/tramp-cache.el (tramp-connection-properties): Adapt docstring.

* lisp/net/tramp-gvfs.el (tramp-gvfs-do-copy-or-rename-file): New defun.
(tramp-gvfs-handle-copy-file, tramp-gvfs-handle-rename-file): Use it.
(tramp-gvfs-handle-make-directory): Reimplement PARENTS handling,
"gvfs-mkdir -p ..." does not work robust.
(tramp-gvfs-maybe-open-connection): Adapt `tramp-get-method-parameter' call.

* lisp/net/tramp-sh.el (tramp-methods):
Add `tramp-remote-shell-login' parameter where it fits.
(tramp-get-remote-path): Use it.
(tramp-make-copy-program-file-name): Fix quoting for "psftp" method.
(all): Adapt `tramp-get-method-parameter' calls.

* lisp/net/tramp.el (tramp-methods): Adapt docstring.
(tramp-get-method-parameter): Replace argument METHOD by VEC.
Check also for hits in `tramp-connection-properties'.  Adapt docstring.
(tramp-get-remote-tmpdir): Cache only the local name of tmpdir.
(all): Adapt `tramp-get-method-parameter' calls.

* lisp/net/trampver.el Update release number.

* test/automated/tramp-tests.el (tramp--instrument-test-case):
Add "^make-symbolic-link not supported$" to `debug-ignored-errors'.
(tramp-test13-make-directory, tramp--test-adb-p)
(tramp--test-smb-or-windows-nt-p): Simplify.
(tramp--test-ftp-p, tramp--test-gvfs-p): New defuns.
(tramp--test-special-characters): Fix docstring.  Add gvfs and ftp tests.
(tramp--test-utf8): Fix docstring.