Filter levels in or out of a FrameList based on attribute values
filter_in(frame_list, key, values)filter_out(frame_list, key, values)
a list of EprimeFrame objects
the name of the attribute to filter in or out
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.