Add regression test capability for DG100/DG200 format. (#554)

Add regression test capability for DG100/DG200 format. (#554)

* add regression test cabability for dg100 format.

The test compares any written data with the subsequent bytes in the
reference file.  The test supplies any read data from the subsequent
bytes in the reference file.

A reference file can be created from the debug output at level 5
when reading an actual globalsat device:
egrep 'Receiving|Sent' "$log" | sed 's/^Sent: //' | sed 's/^Receiving //' \
| sed 's/RX:.*//' | xxd -r -p > "$log".bin
This creates a binary file from all the bytes transferred to or
from the device.

* update serialization reference files.

Even though the dg100 regression formats are internal, they still
get serialized.  The GUI ignores them.

* Fix memory leak exposed by new dg100 regression test.

By using QList instead of homegrown dynarray16 class.