GCS: Fix Q_ASSERT in MagicWaypoint

Work on #223
Overo log: Dont count 255 as invalid sync bite

Since transfer blocks are padded with this at the end it can be
ignored.
GCS: Fix Q_ASSERT in notifytablemodel

Thanks to Filnet catching this one.

Work on #223
Merge pull request #313 from peabody124/random_fixes

Random fixes