`snp`
- Increase `max-depth` from 1M to 100M to avoid calculation errors at very deep sites.
General improvments
- Fix a bug that `featureCounts` didn't output name sorted bam file.
- Fix a bug that `Median Enriched Reads per Valid Cell` in `target_metrics` used all cell number as denominator, not valid cell number.
- Fix a problem that the Q30 metrics in the html report showed too much precision.