[PATCH] better handling of symlinks in path

[David Allouche]

Here is a patch that modifies branch._relpath and the associated
whitebox tests to more correctly handle symlinks in the paths leading to
the current tree.

The problem I faced is that when the current directory
is /foo/bar/gam/dev and /foo/gam is a symlink to /foo/bar/gam, then "bzr
cat /foo/gam/dev/fail" would faile with an error looking like:

[27610] Sat 18:06:38.343 ERROR: not a branch: path u'/foo/gam/dev/file'
is not within branch '/foo/bar/gam/dev'

So I made branch._relpath a little smarter with handling symlinks.

One trick though, is that symlinks must not be expanded when they are
the last element of the path, because need a way to refer to an
version-controlled symlink.

Another trick is that we need to handle trailing . and .. properly.

With this path, I can at last use bazaar.el to ediff my code.
-- 
                                                            -- ddaa

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