[MERGE][Bug #129694] WorkingTree.unknowns() does not always return accurate list of unknown files

[Daniel Watkins]

Attached is a bundle which ensures that WorkingTree.unknowns() does
return an accurate list of unknown files by ensuring that when the
WorkingTree is unlocked the cache of ignore definitions is cleared.

While it does fix this bug, there is still opportunity for stale ignore
definitions to be used if the tree hasn't been unlocked between the
changes to .bzrignore and the reference to the ignore definitions.

-- 
Daniel Watkins (Odd_Bloke)
University of Warwick Christian Focus President
University of Warwick Computing Society WUGLUG Liaison Officer
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