add option to reorder cached RRs in answers
Fixes https://gitlab.labs.nic.cz/knot/resolver/issues/93. API of a KR_EXPORT function is changed, so ABIVER is bumped.
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Fixes https://gitlab.labs.nic.cz/knot/resolver/issues/93. API of a KR_EXPORT function is changed, so ABIVER is bumped.