CDX (Not BDB) by default

[PsypherPunk]

The de facto standard for serving web archive indexes seems to be via CDX, not BDB. However, Wayback defaults to BDB out-of-the-box and our current documentation recommends commenting out/un-commenting the defaults.

I'd suggest we either switch the defaults entirely. Given that BDB can be useful for testing/quick-deployment, however, it should still be easy to deploy (could we handle this with a Maven profile, for instance?).

[ibnesayeed]

I would second the idea of making the CDX to be the default setup.

[kris-sigur]

I'll "third" it. May also resolve #151, at least partially.

[ibnesayeed]

Let me list the things we need to do in order for this to happen.

• Change the configuration XML file(s).
• Update the documentation.
• Automatic CDX indexing would be a plus to have a good out of the box experience.
• WatchedCDXSource A new WatchedCDXSource. #184 for dynamically including new CDX.
• Anything else?

This change may deserve a dedicated minor release.