Connect extract operation to progress calculation.

Ignore senders which are sending 100% more then once, got that from
7z lib at the extracting step.

Task-number: QTIFW-11
Task-number: QTIFW-141

Change-Id: I7750f9e49d5705df91e6c79c7ee2b0530e156e84
Reviewed-by: Karsten Heimrich <karsten.heimrich@digia.com>
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>