workflow: Use lists to represent state of scatter steps.

Lists are more convenient than vectors, and all the more so when
dealing with the state monad.

* ravanan/job-state.scm: Import (srfi srfi-1). Do not import (ravanan
work vectors).
(job-state-status): Use lists instead of vectors to represent state of
scatter steps.
* ravanan/workflow.scm (workflow-scheduler)[schedule, poll,
capture-output]: Use lists instead of vectors to represent state of
scatter steps.
(maybe-vector?): Delete function.
(maybe-list?): New function.
(merge-values): Support merging lists instead of vectors.

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