[PATCH 1 of 8] match: introduce explicitdir and traversedir

[Matt Mackall]

On Fri, 2013-05-03 at 15:05 -0700, Siddharth Agarwal wrote:
> +    def explicitdir(self, f):
> +        self.dir(f)
> +    def traversedir(self, f):
> +        self.dir(f)

Follow-up with some docstrings, please.

-- 
Mathematics is the supreme nostalgia of our time.