Symbolic links inside the DWiki page area now cause redirections if their value would be a valid redirection in a REDIRECT line.

For example: FrobTig, which is a symlink in /Aliases with the value '../People'.

We could have tried using os.path.realpath() on the symlink and taking the result relative to the store root, but I think that that has more subtle explosive breakages.

Symbolic links that don't resolve to a real DWiki page this way are interpreted normally, so you can still have symlinks that point to files outside the DWiki pagestore root.