* files.el (directory-listing-before-filename-regexp): New

* files.el (directory-listing-before-filename-regexp): New
defvar.  Replaces `dired-move-to-filename-regexp' from dired.el.

* dired.el (dired-move-to-filename-regexp): Removed.  All
occurences replaced by `directory-listing-before-filename-regexp'.

* dired-x.el, locate.el, vc.el: Replace
`dired-move-to-filename-regexp' by
`directory-listing-before-filename-regexp'.  In vc.el it is
overwritten locally; maybe this can be handled in files.el too.

* net/ange-ftp.el (ange-ftp-date-regexp): Removed.  All occurences
replaced by `directory-listing-before-filename-regexp'.

* faq.texi (Bugs and problems): Replace
`dired-move-to-filename-regexp' by
`directory-listing-before-filename-regexp'.