roll back 2.0.10 wagon to beta-2

[Brian E. Fox]

There are still issues with the scp wagon beta-3 that represent a
regression over 2.0.9. I'm thinking we should roll 2.0.x back to beta-2
now that there is 2.1.x for people to use. Does anyone have a strong
opinion on this? If we pull it back then 2.0.10 is ready to go.