Update headers.

Update headers.
(compile-elisp-module, compile-elisp-modules, install-file,
install-files, install-elisp-module, install-elisp-modules,
install-overwritten-file-modes): Add doc string.
(compile-elisp-module, compile-elisp-modules, install-file,
install-files, install-elisp-module, install-elisp-modules,
install-update-package-files): Rename arguments.
(compile-elisp-modules, install-files, install-elisp-modules):
Use `while' instead of `mapcar'.
(install-file): Use `install-overwritten-file-modes'.
(install-elisp-module): Use `install-file'.