summary of changes
- Python 3.7
- Floating point ninjutsu to avoid numerical underflow
- Eliminate tail recursion in `LeavesAndClades.logf` likelihood via bottom-up memoization. Avoids recursion depth limits
Follow updated install instructions in [`README.md`](README.md) to set up a new Conda environment.
v1
The original gctree, as released in the MBE paper. Python 2.7