Add more debug info
- Check if each end aligned to opposite strands before calling SNPs.
- Use centralized debug code for MemStats, Alignment Info (including TP, FP, FN info)
- Add FN trace back and print FN info.
Fix a bug: check if SNPs exist before print them.
Fix bugs: check for deletions, check for proper interval of FNs.
Fix a bug
Add right alignment positions to FN trace back.
Put FN info to global variables, re-organize functions in debug module.
Fix a bug: need to determine exactly FN based on call cutoff quality.
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