From now, population is only responsible for managing the saving, loading and random selection of its tree items, but not for filtering their nodes for specific mutation operators.
coverage: 88.294% (+0.04%) from 88.252%
when pulling a5b37d2ff6fc54bcaa8c5876957916e9b725d211 on pop-select
into 9130cac267faddb4c36e457bf1ede434ab18b818 on master.
From now, population is only responsible for managing the saving, loading and random selection of its tree items, but not for filtering their nodes for specific mutation operators.