* files.texi (File Names): Reorganize description.

* files.texi (File Names): Reorganize description.
(Visiting): Add xref to Mode Line.  Copyedits.
(Save Commands): Mention prefix behavior of C-x C-s.
(Numbered Backups): Node deleted.
(Backup Names): Contents of Numbered Backups moved here.  State default
of version-control variable.
(Reverting): Copyedits.
(Version Control): Add additional version control systems.

* emacs.texi (Top): Delete Numbered Backups node.

* cmdargs.texi (General Variables): Change Numbered Backups xref to
Backup Names.