* tramp.el (tramp-handle-file-accessible-directory-p): Check for
`file-readable-p' instead of `file-executable-p'.
* tramp.texi (Inline methods): Reinsert `plinkx'.
(External methods): Do not mention session names anymore.
* tramp-sh.el (tramp-methods) <plinkx>: Reinsert.  There are
cases, where "plink -ssh" is not desired.
(top): reinsert completion function for "plinkx".
* lisp/tramp-sh.el (tramp-find-inline-encoding): Do not match "%%t" for
a temporary file name.