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This reverts commit 6e6625bd.

Discussed at
https://github.com/ipld/go-ipld-prime/pull/126#issuecomment-753003441

Long story short, the motivations of this rename are good,
but the new name also carries some connotations we're really not sure
about, and so we're going to undo this for now, and continue to think
about it in the future.

This should be more intuitive to Go programmers, since assignments are
generally trivial operations, but conversions imply that extra work
might be needed to adapt the value to fit in the recipient.

The entire change is just:

	sed -ri 's/AssignNode/ConvertFrom/g' **/*.go

Downstream users can very likely use the same line to fix their function
declarations and calls.

Fixes #95.

rot13adl demo: finish documentation; simplify Reify; more recommendations about how to implement Reify; consistent export symbol conventions; some fixes.