Use match-string and drop useless `function's.

Use match-string and drop useless `function's.
(ange-ftp-get-process): Bind `ange-ftp-this-user' and
`ange-ftp-this-host' before running ange-ftp-process-startup-hook.
(ange-ftp-ls-parser): Use `switches' arg instead of dynamic binding.
(ange-ftp-parse-dired-listing): Update the calls.
(dired-local-variables-file): Declare to shut quieten the compiler.
(ange-ftp-file-entry-active-p): Remove.
(ange-ftp-file-name-all-completions, ange-ftp-file-name-completion):
Don't exclude dangling symlinks.
(ange-ftp-file-name-completion-1): Make predicate optional.
(ange-ftp-parse-list-func-alist): Use add-to-list to update.
(ange-ftp-fix-name-for-bs2000): Use subst-char-in-string.
(ange-ftp-bs2000-posix-hook-installed): Remove.
(ange-ftp-add-bs2000-posix-host): Don't use it anymore.
(ange-ftp-bs2000-cd-to-posix): Use `ange-ftp-this-user' and
`ange-ftp-this-host' instead of `user' and `host'.