posix: workaround for os.path.realpath bug in Python 2.4.1 and before
os.path.realpath didn't resolve symlinks that were the first component of
the path, see http://bugs.python.org/
issue1213894
largefiles: remove redundant documentation
The extension help text already covered what was in usage.txt and
design.txt is now moved to the wiki:
http://mercurial.selenic.com/wiki/LargefilesExtension