modification of table sread:
- change name of column 'extID' to 'qname'
- introduce new column 'misMNuc' which contains bases which did not match the reference with offset

modification of load table of sread:
- change name of column 'extID' to 'qname' and 'inPos' to 'insPos'

Add new sql script files: index_sreadLoad and merge_sread.

Complete map of sread.