Parallel - generic functions for coordinating parallel workers

This is parallel, a collection of generic functions for coordinating parallel workers.

This package includes these functions:

• Consumers, for managing a set of N workers consuming a stream of values produced by the caller
• Producers, for managing a set of N workers producing a stream of values consumed by the caller
• Values, for concurrently producing a set of N values
• Pool, for managing access to a pool of concurrent workers