cv_generator: generate folds for nested cv
dfm_gen: added optional lowercasing parameter
estimator: estimate model and performance based on parameters
feat_select: select features based on textstat_keyness
metric_gen: convert output from estimator to model performance metrics
modelizer: updated for new pipeline
modelizer_old: old model pipeline
out_parser: now correctly exported
query_string: renamed x parameter to query, added fields parameter to select what fields to return and random boolean parameter to define whether the returned results should be randomized
out_parser: function to parse raw text output into a single field, either from _source or highlight fields
dupe_detect: updated function to use 'ver' parameter for versioning