Add codebook for generic data.frame

[1beb]

In order to document a dataset appropriately, we would need some additional meta data about the data set. A csv file that identifies the alias (column name), a description (like question text) and a note (like filter text). We may also want to add an additional field like group variable, that would group a number of aliases together as a categorical array or multiple response style question (for the purposes of presentation in the codebook). Otherwise, a data.frame ought to be appropriately coded with factors for categoricals. Perhaps if a factor had > 20 categories it automatically gets converted to a verbatim type field.