[MERGE] remove has_key() usage

[Robey Pointer]

I've posted a branch at:

	http://www.lag.net/~robey/code/bzr.dev.no_has_key/

which removes the remaining usage of [dict].has_key() that I found in  
bzr.dev.  No new features were added, no bugs were fixed, and nothing  
really was accomplished except housekeeping.  It just kept me busy on  
the train.  :)

Patch attached for review.

robey


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