* examples/random-manifest.scm (random-computed-file): Add ‘dependency’
parameter and honor it.
<top level>: Replace ‘unfold’ call with a loop; pass ‘dependency’
argument to ‘random-computed-file’.
* examples/random-manifest.scm (random-computed-file): Add
'multiple-outputs?' parameter and honor it.
(unfold): Produce 15 entries; pass 'multiple-outputs?'.