Upstream couchdb

[PromyLOPh]

See https://issues.guix.gnu.org/issue/39881

Figure out how Erlang modules work and split off external dependencies:

• bear (https://github.com/boundary/bear)
• dreyfus (https://github.com/cloudant-labs/dreyfus)
• folsom (https://github.com/boundary/folsom)
• hyper (https://github.com/GameAnalytics/hyper)
• jiffy (https://github.com/davisp/jiffy)
• meck (https://github.com/eproxus/meck)
• mochiweb (https://github.com/mochi/mochiweb/)
• proper (https://github.com/proper-testing/proper)
• rebar (https://github.com/rebar/rebar)
• recon (https://github.com/ferd/recon)
• snappy (https://github.com/skunkwerks/snappy-erlang-nif)

[PromyLOPh]

couchdb is not used any more and thus unmaintained. Removed.