* Revert "browse: sort listing by dir first (#1527)"
commit 4e1229e7c9bd5643ed079f3dafa25df4e426da56.
* Add new browse sort order namedirfirst. Make namedirfirst default sort
* Use helper functions in staticfiles to redirect.
Previously the browse package invoked staticfiles.Redirect when
redirecting clients who requested a directory but with a Request-URI
that did not contain a trailing '/'. staticfiles.Redirect only used a
relative URI. This change defers the decision of how to format the
Location header value to the helper methods in the staticfiles package.
* Update const URLPathCtxKey in browse package.
