(nslookup-prompt-regexp, ftp-prompt-regexp)

(nslookup-prompt-regexp, ftp-prompt-regexp)
(smbclient-prompt-regexp): Add usage note to doc string.
(ftp-font-lock-keywords, smbclient-font-lock-keywords): Removed.
(ftp-mode, smbclient-mode): Don't set `font-lock-defaults'.
Use add-hook for adding the comint filter function, and only do so
if it's not already in the global hook list.
(ftp-mode, smbclient-mode, nslookup-mode): Remove redundant calls
to `make-local-variable'.
(nslookup-font-lock-keywords): Remove prompt entry.
(nslookup): Don't set the process-filter.
(finger): Exit the loop correctly when the regexps list runs out.
(ftp, smbclient, smbclient-list-shares):
Set the real major mode immediately, not after execing.
Use `pop-to-buffer' instead of `switch-to-buffer-other-window'.