New Help Topic and a Few Bug Fixes on the Free FCC Ham Radio License Practice Exams

A new help topic on gray-line propagation has been added to the extra class practice exam. Any feedback would be very appreciated.

The ham radio practice exams have been updated again. There was a bug that was causing some tests to hang up on their last question. It's fixed! The figure E5-2 was missing, and has been added to the tests.

If you spot anything else, please contact me at hcarter333@gmail.com