Updated the info for version 6

[tatarize]

I recently went to implement version 6 to have access to the threads info in the header and consequently had to map out the data correctly. The changes are that the threads given in the header are used rather than the PEC-Threads and there's an object at the end of the PES section (after the control codes) which governs grouping and sew order. I didn't give it much time but it's usually in U32 0 0 0 0 1 0 2 0 3 0... without it PE-Design crashes, but the default values seem to work.