1. Forward Domain Proxy. I wasn't sure if this method was appropriate for the wizard,
but Jens says it is. I've added it.
2. In the process of doing so, I decided that the Provider.converter field was overly
complexified; I tried too hard to reduce the number of functions I needed to define,
but in the process outsourced some of the logic of converting the Wizard's dataset
into a property typed request to the `commit` phase, which was inappropriate. All
of the logic about a provider, aside from its display, should be here with the code
that distinguishes between providers. This commit makes it so.
3. Small CSS fix: the fields inherited from the Proxy provider forms had some unexpected
CSS which was causing a bit of a weird indent. That has been rectified.
889adecad1