utils/sim2.py: Fix Node.leaves inaccuracy in PCR trees from new algorithm. - Sometimes the reads won't finish being distributed, resulting in fewer leaves than intended.
utils/sim2.py: Fix Node.leaves inaccuracy in PCR trees from new algorithm.
- Sometimes the reads won't finish being distributed, resulting in fewer leaves than intended.

makrutenko/dunovo,makrutenko/dunovo,makrutenko/dunovo