The term `recipient` is commonly used to refer to the address to which a
note is sent; however, a bundle may include multiple outputs to the same
recipient. This change is intended to clarify this usage.
Co-authored-by: Daira Emma Hopwood <daira@jacaranda.org>
Criterion's benchmark grouping does not match on group names; it only
groups benchmarks that are run prior to that specific benchmark group
instance being dropped. Since each benchmark group holds a mutable
reference to the criterion instance, this means we can't have multiple
active groups collecting measurements. Instead, we need to collect the
proving benchmarks for all recipient numbers, followed by verification
benchmarks.