uber calibration groups issue

[topepo]

There are group arguments to the cal_plot_* and cal_estimate_* functions. There are overlaping issues regarding groups (#79, #92,#98, #100). Looking at these, we should have a more systematic approach rather than multiple refactors that might overlap.

I think that we should only enable group-by processing when the input is a data frame (and not an object generated by the tune package). We should default to using .config for tune objects when there are multiple configurations (and NULL otherwise).

Change 1

In the many functions it is set in both the S3 generic and also in an internal helper called tune_results_args().

• For non-tune S3 generics, allow the user to set it as an argument and validate it in the generic with a helper function.
• For tune generics, give no group argument and set group to .config if there are multiple configurations.

The logic for group should not be in multiple places so it should be taken out of tune_results_args().

Change 2

The user-facing argument should be called .by to be consistent with new dplyr syntax. It should only accept a single, categorical column in the data.

[EmilHvitfeldt]

change 3

error if grouped data.frame passed to functions. Refer to .by argument

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