[RFC] Remove bzrlib.branch.BzrBranchExperimental

[Robert Collins]

After the recent review where John got confused by
BzrBranchExperimental's difference to the other branch/branch formats, I
had a poke around and its not used anywhere nor does it have new
features. I've chatted with Martin and hes ok with it being removed.

Its intended to be part of a cleanup of how the Branch/BranchFormat
stuff works, but its currently incomplete, and crucially, not finished
nor ready as a base for folk to move forward on. I propose we remove it
until a fuller cleanup is done, where the code layout can stay
internally consistent.

If noone objects I'll do that later today before the freeze.

-Rob


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