utils/errstats.py: Fix two off-by-one errors (or is it three?). - Represent mate number in --overlap-stats as 1 or 2, not 0 or 1. - "end" position was previously 1 too large.
utils/errstats.py: Fix two off-by-one errors (or is it three?).
- Represent mate number in --overlap-stats as 1 or 2, not 0 or 1.
- "end" position was previously 1 too large.

makrutenko/dunovo,makrutenko/dunovo,makrutenko/dunovo