CapTP Descriptors: NewRemoteVowDesc
NewRemoteVowDesc(importPos :ImportPos, rdrPos :AnswerPos, rdrBase :SwissBase)
An exported Promise becomes a new ImportedVow with a shortening rdr in the Answers table.
The sending side must also locally:
Ref whenResolved(promise, redirectorQ)
where redirectorQ is the corresponding question for which the redirector of the new remote vow will be the answer.