Duplicated ISO codes for multiple glottocodes

[Lavmint]

Same ISO drl for band1337 and darl1243
Same ISO khk for dark1243 and halh1238

Glottolog ref glottolog/glottolog#1050

[drammock]

glottocodes are more granular than ISO 639-3 codes, so it is expected that sometimes the same ISO will map to more than one glottocode. Is the issue that the mapping is wrong? A quick glance at glottolog suggests maybe:

• halh1238 -> khk
• dark1243 -> drh
• darl1243 -> drl
• band1337 -> was merged into drl (https://glottolog.org/resource/languoid/id/band1337)

which would suggest dark1243 might need to be changed?

[bambooforest]

Glottolog updates regularly and takes into account changes in ISO 639-3 and whatever new information about languages in general that's been published or noted as incorrect by scholars. We should probably do a full check of all codes for the current version.