[MERGE] make sha1_provider a parameter to DirState()

[Ian Clatworthy]

Martin approved my patch for content filtering (about) two weeks ago
but it's been blocked on how best to layer it over DirState (rather
than teach DirState about content filters as I was doing).

This patch enhances DirState so that a custom object can optionally
be passed in that has responsibility for generating sha1 values
and the stat. I think this is pretty clean and all dirstate tests
pass for me now, both the python and C stuff.

My tweaked content filtering code will have the WorkingTree provide
one of these, one that knows about what files, if any, gets filtered
and how.

Ian C.
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