[MERGE] integrated EOL conversion support

[Ian Clatworthy]

End Of Line conversion needs to be provided out-of-the-box.
This takes the code from the experimental bzr-eol plugin,
adds more tests and fixes a bug those tests triggered.

I'd greatly appreciate it if someone could apply this patch
on Windows, run "./bzr selftest test_eol" and confirm all
the tests pass there.

It will be a happy day when this lands in bzr.dev!

Ian C.
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