build_committee_set: Build committee set
In vcerqueira/tsensembler: Dynamic Ensembles for Time Series Forecasting

A function for creating the committee set without the final training of the models.

1 2	build_committee_set(form, data, specs, lambda, alpha, depth = NULL, aggregate_subsets, aggregate_hypos)

`form`	formula
`data`	training data
`specs`	object of class `model_specs-class`. Contains the parameter setting information for training the base models;
`lambda`	smoothing window size
`alpha`	contiguity interval size
`depth`	depth size how large is the maximum size of the subsets. If NULL, defaults to no. of predictors minus one.
`aggregate_subsets`	aggregation approach for the set of subsets.
`aggregate_hypos`	final aggregation approach. How should the combined opinions be aggregated.