[PATCH] better handling of symlinks in path

[David Allouche]

Here's the new version of the patch, which tries to address the
readability problems mentioned in the last review.

For the record, this patch fixes a problem when 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 fail 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'

It also does some incidental cleanups, removing an unused cruft function
and fixing some style in code near to the modifications.
-- 
                                                            -- ddaa
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