Problems:

The reset command (int) crashes the scanner in some cases.

I'm missing the last data block, and the end Block, so I am scanning one line more
than needed, so be careful to use the maximal scan-size, better use one line
fewer.

There is no check for correct arguments for definition of the scan area.

I had to insert some wait_for_acknowledges after some commands for which the handbook
says not that its necessary, but the scanner doesn't work without the
waits. Maybe this is wrong and I should try it with test_unit_ready.

