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Name confusion between inverse metric, metric #803

@bob-carpenter

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@bob-carpenter

EDIT: This is worse than I thought.

If I take a fitted model and do this:

fit = model.sample(...)
metric = fit.metric

then the right way to restart is as follows.

    metric={"inv_metric": metric}`

This is confusing because of the mismatch. Something must be misnamed. If I use 1 / metric instead of metric to get the inverse of what fit.metric returns, then the sampler grinds to a halt because of the anti-conditioning.

What I would really like is to be able to write is the following.

    metric=metric

It would be helpful to call out the various cases of specifying an (inverse) metric with bullets the same way inits is documented---as is, it's hard to visually identify the cases.

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