[MERGE] is_ignored improvements...

[Aaron Bentley]

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Jan Hudec wrote:
> It splits the WorkingTree.is_ignored method to ignored, which returns just
> a boolean and ignored_by, which returns the pattern. is_ignored is deprecated
> forwarder to ignored_by (to remain compatible).

That raises an interesting question: 0.8 was supposed to be our API
stability release.  That would mean we can't deprecate anything until
post 1.0, or at least not anything important.  So what should we do in
cases like this?

Aaron
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