[#391] Avoid aliases in nettest

Description

Rewrite nettest interface to avoid use of aliases. So now those methods only accept address-like things.

No more AddressResolved wrappers!

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To be done after the next review:

• Update commit messages with s/donator/moneybag
• Update commit message in "Make resolveAddress polymorphic"
• Update nmiGetAlias in an earlier commit

Related issue(s)

Resolves #391 (closed)

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