[TDF] Pass column names and types to Book, not to Helper
[TDF] Pass column names and types to Book, not to Helper

This is a small change in interface that should make possible, in
the future, to add jitted custom actions. For example, a call to
Book(Helper(), {"c1"}) now can detect the need of and proceed with
jitting and executing the corresponding template call
Book<C1_t>(Helper(), {"c1"}).

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