Strip prices after valuing postings in PostingsReport.
Use renderRow interface for Register report.
For reg -f examples/10000x10000x10.journal, this results in:
- Heap allocations decreasing by 55%, from 68.6GB to 31.2GB
- Resident memory decreasing by 75%, from 254GB to 65GB
- Total (profiled) time decreasing by 55%, from 37s to 20s