Make seq_char also work properly on insertions/deletions that occur in the CIGAR string. Furthermore, add some extra error checks
Make seq_char also work properly on insertions/deletions that occur in the CIGAR string. Furthermore, add some extra error checks

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb