filter_in: Filter levels in or out of a FrameList based on attribute...
In rprime: Functions for Working with 'Eprime' Text Files

Filter levels in or out of a FrameList based on attribute values

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filter_in(frame_list, key, values)

filter_out(frame_list, key, values)

`frame_list`	a list of `EprimeFrame` objects
`key`	the name of the attribute to filter in or out
`values`	the whitelisted or blacklisted values of the attribute

for filter_in, only log-frames where key is one of the values are kept. for filter_out, log-frames where key is one of the values are omitted.