hgweb: forward archivelist() of hgweb to webutil self.configlist() is ui.configlist(untrusted=True), and url=None in templater effectively means 'url' is undefined.

hgweb: move archivelist() of hgwebdir to webutil

hgweb: drop archivespecs from requestcontext It's a constant.

hgweb: move archivespecs to webutil Move one step further from e38e7ea21987. Since 'archivespecs' is a constant shared with hgweb and hgwebdir, webutil is a better place to define it.