[PATCH 2 of 4 v4 lazy-manifest] manifest: use lazymanifest instead of manifestdict

[Matt Mackall]

On Tue, 2015-03-03 at 18:05 -0500, Augie Fackler wrote:
> # HG changeset patch
> # User Augie Fackler <augie at google.com>
> # Date 1420746668 18000
> #      Thu Jan 08 14:51:08 2015 -0500
> # Node ID 4087ba22f339685d731c4a5607d1131a1676eb19
> # Parent  575515f3cdc7bc8cb826ea17fa365d1f359ab88f
> manifest: use lazymanifest instead of manifestdict

This tightly couples the Python side to the C side such that 'make' is
necessary. Which means we've got bisect headaches for the next year or
so.

Rather than introduce the pure class in pure/, introduce it in
manifest.py. Then switch to the C version if it's available at run-time,
please.

-- 
Mathematics is the supreme nostalgia of our time.