…ependency"

(commit d720fe6)

This brings back copy_ireq_dependencies and combines its use with that of the
proxies-for-naming. Editable and url_requirement ireqs are not cached by the
Repository, so when dependencies are queried for them once, no dependencies
will be found later for the copy made by combine_install_requirements.

copy_ireq_dependencies links those dependencies at the time of copy.

round of resolution.

By this point, we've frozen the dependencies.

Fixes jazzband#1054

Co-authored-by: Andrew <harta5039@gmail.com>

when combining instances

…uirement

instances in combine_install_requirements

to ensure nothing else was emitted