bug#324: Uniquify Tramp buffers

[Oliver, Peter (E.ON IS UK)]

Buffer names don't get uniquified correctly when opening the same file on multiple hosts with Tramp. 

For example, after opening files "/host-a:/tmp/foo" and "/host-b:/tmp/foo", you get buffers named "foo" and "foo<2>".  I would expect the buffer names to be something like "host-a:/foo" and "host-b:/foo" (depending on the value of uniquify-buffer-name-style).

I see this with GNU Emacs 22.2.1.  It used to work as expected with version 21.

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