rbt post was assuming that the repository URL provided should take

precedence over the repository name. The problem is that Subversion can

be given a repository URL that it can use for communicating with the

repository, but that URL isn't necessarily the one we want for lookup.
The Subversion issue should be fixed separately, but it's safe to say

that the repository name is a better option if provided. We now use that

over the URL if we have it.

Posted a change, providing both --repository and --repository-url. It

matched against the name.