Pleas add the blind scan function for Dvbfinder application

[xmh0511]

I think Dvbfinder is good in other respects except that it lacks the function of the blind scan. The parameters of the transponders of a satellite may be frequently modified. If we can lock the signal by using a set parameter, we can use the blind scan function to update the parameter list and record which tv programs are on the corresponding transponders. Please pay attention to this issue. That's an important function we need.