Minor ls-lisp changes.

Minor ls-lisp changes.
* lisp/ls-lisp.el (ls-lisp-ignore-case, ls-lisp-dirs-first)
(ls-lisp-verbosity): Add custom :set-after property.
(ls-lisp-verbosity, ls-lisp-use-localized-time-format): Doc fixes.
(ls-lisp-format, ls-lisp-format-time): Don't take `now' as an argument.
(ls-lisp-insert-directory): Update caller.