[MERGE][1.6] Deprecate knit repositories.

[Andrew Bennetts]

Hi all,

This simple patch causes knit repositories to emit warnings, just like weave and
earlier repositories already do.  Here's what it looks like to the user:

$ bzr st
Format <RepositoryFormatKnit1> for file:///tmp/whatever/.bzr/ is deprecated - please use 'bzr upgrade' to get better performance

Packs are so much better than knits, we probably should have done this a couple
of releases ago :)

It perhaps deserves a test, but it's trivial enough that I figured I'd send it
the list as is anyway.

-Andrew.

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