Heap corruption during channel scanning

Yeah, that's a really nasty implementation. I don't think that I need a class either, could just be a function that returns a std::vector<Glib::ustring>. I'll reimplement that for the next release.

Thanks for testing the ATSC scanning feature, does it work? You'll note that the dialog tells you that it's unsupported because no one is testing it. Maybe, with your help we can make this a supported feature.

Basically scanning works. There are few caveats but scanning for SD/HD channels works (tested only cable). Channel names are correctly identified.

Issues:
 Me-TV is not adding "unnamed" channels. I believe that it is related to missing information from PSIP. I see few transponders with unencrypted channels with no data sent over PID 0x1ffb. Workaround is to scan for channels with scan/w_scan and import channels.conf.

 Comcast (my provider) apparently still uses QAM64 so it would be convenient to use auto-detection of modulation. Since AUTO currently does not work for me and I'm not sure if there is any chance to get it working (even if this would work, I think that channel switching is already slow enough).

 As a workaround for above I was using initial tunning file containing lines for both QAM64 and QAM256 like following:
A 663000000 QAM256
A 663000000 QAM64
A 669000000 QAM256
A 669000000 QAM64
The problem is that Transponder::operator== compares only transponder frequency. This causes scanner to ignore QAM64 lines. I think that at least modulation shall be included in comparison(current behavior may be also wrong for Satellite systems).

The heap corruption is issue is being fixed now and I'll talk to you about the the other stuff over email.

My new implementation has been pushed to the stable branch.