* pcvs.el: Add a minimal leading commentary.

* pcvs.el: Add a minimal leading commentary.
(cvs-make-cvs-buffer): Change the header part by removing the startup
message and adding a `Module' entry.  Also replace the FOOTER and
HEADER special fileinfos with the new support in ewoc for updating
its own footer and header.
(cvs-update-header): Update to use the header/footer of the ewoc.
(cvs-mode): Use define-derived-mode and set truncate-lines to t.
(cvs-is-within-p): New function.
(cvs-mode-run): Take advantage of `save-some-buffers's new ability
to only examine some subset of the buffers.
* pcvs-info.el (cvs-fileinfo-pp): Use the new property-preserving
`format' instead of our own ad-hoc functions.
Remove HEADER and FOOTER cases, now handled in the EWOC.
(cvs-fileinfo<): Remove HEADER and FOOTER cases.
* pcvs-parse.el (cvs-parse-run-table): Change message for unknown
output to avoid scaring the user.
(cvs-parse-table): Catch message for non-up-to-date commits.
* pcvs-defs.el (cvs-startup-message): Remove.
(cvs-global-menu): New autoloaded menu.
* pcvs-util.el (cvs-string-fill): Remove.
* emacs-lisp/ewoc.el (ewoc--create-special-node): Remove.
(ewoc--refresh-node): Don't take the whole EWOC but only the relevant
PP part of it and also make it work for footers and headers.
(ewoc-create): Drop POS and BUFFER arguments.
Use the DLL's dummy node to store the end-of-footer position.
(ewoc-map, ewoc-invalidate): Update call to ewoc--refresh-node.
(ewoc-refresh): Remove unused `header' variable.
(ewoc-(get|set)-hf): New functions.