transcription-data to be added for first release

[LinguList]

• [x] phoible: first proof-of concept is done
• [ ] fonetikode: checked the data, but adding it is pending
• [x] pbase: needs to figure out how to link
• [ ] index diachronica (just link to available sounds)
• [x] wikipedia (link to available sounds)
• [ ] jipa (pending that @SimonGreenhill publishes his paper)

[LinguList]

Ruhlen's data is quite challenging to add, so we may just ignore it for the time being. Fonetikode fails to link the majority of the data as well.

[LinguList]

We have a lot of the data now, maybe nto always in best shape, but let's leave it at this.