(uniquify-buffer-name-style, uniquify-after-kill-buffer-p)

(uniquify-buffer-name-style, uniquify-after-kill-buffer-p)
(uniquify-ask-about-buffer-names-p, uniquify-ignore-buffers-re)
(uniquify-min-dir-content, uniquify-separator, uniquify-trailing-separator-p):
Remove redundant group specification.
(uniquify-file-name-nondirectory): Delete.
(uniquify-rationalize-file-buffer-names): Simplify.
Use directory names as `filename' component of uniquify-item.
(uniquify-get-proposed-name): Adjust now that `filename' does not
include `base'.