Refactoring of Exceptions

[John A Meinel]

I just committed a change on my integration branch which refactors some
of the NoSuchFile, FileExists, etc exceptions.
While I was working on the win32 changes, I was getting some unhelpful
exceptions, so I decided to refactor them. Now they are BzrNewErrors,
and all of them give a path, as well as giving the original exception, etc.

It also means that "osutils.relpath" now raises PathNotChild rather than
raising NotBranchError().

Which meant I found a few places that were catching the wrong exception
(NoSuchFile used to be a child of IOError, etc).

John
=:->

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