let RequiredBy generate lists directly, use hashes to trim down duplicates directly. Optimize for !wantarray, by telling whether the list is empty or not.

prepare for a second similar list (REQUIRING) that will replace pkgdep, since
pkg_add -r spends a hell of a lot of its time reading/writing long
packing-lists...

Use the simplified interface.

Remove quite a few tests that the RequiredBy list is non-empty that do
nothing but obfuscate the code: just deal with the damn list already.

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