[PATCH 1 of 4 V2] clone: move file stream walk to a separate function

[Durham Goode]

On 5/7/13 11:23 AM, "Kevin Bullock" <kbullock+mercurial at ringworld.org>
wrote:

>On 6 May 2013, at 10:14 PM, Durham Goode wrote:
>
>> # HG changeset patch
>> # User Durham Goode <durham at fb.com>
>> # Date 1367429921 25200
>> #      Wed May 01 10:38:41 2013 -0700
>> # Node ID 672183bf736b045705760066ef102a0a4cb52cca
>> # Parent  a718a0ba6787ae9546d0aa453c8a7dae25d4405b
>> clone: move file stream walk to a separate function
>> 
>> Moves the file walk out of the stream method so that extensions can
>>override it.
>> Also adds store.topfiles() that only walks the non data/ files.
>
>This sure looks like two changes to me...

They are related from a how-they-will-be-used point of view.  I figured
they were small enough to fit together.  I'll split it up in V3.