Fix naming of segment_id / utterance_id / recording_id to be more Kaldi-standard

[benfoley]

Seems that utterance_id is used in elpis/engines/common/output/ctm_to_elan.py whereas it should be recording_id.

Segment_id is being used for what is actually the utterance id.

Segment file is made of <utterance-id> <recording-id> <segment-begin> <segment-end>

Also, check the ctm_to_textgrid file.

[alexis-michaud]

This Issue could safely be closed, couldn't it? Now that HF is used & not Kaldi any longer.
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