2.0. Major rework and tests with gun finished

- Global Error 3 (wrong contrller answer) treating changed. Now,
as for all the rest errors, device goes to FAULT only when three
identical errors in a row occur. To do this, I had to wrap all
requests in "do..while" cycle (ADC request even in two cycles).
- test_message command tested and still works =)
- Some line transfers are added to better show lines at 4:3 moni.