Mathematics quiz in Cornish with some improvements

I have made some improvements to the mathematics quiz apposyans_awrgrymGUI.py in my taklow-kernewek tools.

There is now a facility to set a difficulty level, either easy where numbers are always 1-10 and negative answers are suppressed, medium allowing numbers up to 20 and hard allowing numbers up to 40.

The program asks what 10 + 32 is, the answer of course is 42.

The user has answered the question 19 - 33 incorrectly as -4. The program has repeated the previous question in text and figures along with its answer.

The report at the end shows how many questions were answered correctly, and what the points score was. I may well revise the way this calculated since at present it can reward speed more than accuracy (1 point is given for each correct answer and 10-t for speed where t is the number of seconds taken to answer, up to 10 seconds).