tags: add support for etags format.

* tags.tl (etag-sec-start, etag-pat-end, etag-name-end): New variables.
(tags-opts): Improve --help option's help message. Add -o/--output and
-e/--emacs options.
(tag): Add linum and byte slots. Add etext method.
(file-tag): Initialize type slot to "F", and use it in the text method.
(get-pat): Rename to...
(get-pos-pat): ...this, and return the line number and byte offset in
addition to the escaped line.
(with-tag-shorthand-macro): Initialize linum and byte slots. Remove a
needless splice (of the get-pat/get-pos-pat calls).
(collect-tags-tl, collect-tags-txr): Add clarifying comments.
(write-tagfile): Make use of new -o/--output option.
(write-etagfile): New function.
(toplevel): Set a default value for o.output if -o/--output is empty or
missing. Disallow combination of --emacs and --merge. Remove unused
variable have-arv. Fix double @1 appearing in calls to fnmatch from
excf. Call write-etagfile instead of write-tagfile if --emacs was
provided.

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