fix sgl loading. there were a few issues, the main ones being:

- when the sgl grew too large it became bigger than the maximum frame size
that the ioc would deal with, and then it would just stop doing io. i was
using the wrong field from iocfacts to figure out how large an sgl should
be.
- chained sgls were broken cos i was including the current chain element in
the calculation of the offset to the next chain element.

big ok from marco@

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