Extend fuzz testing

[donkirkby]

The current fuzz test includes assignments, printing, and for loops. Add more types of statements to generate_statements().

To learn how, read about abstract syntax trees and then generate trees from sample code using the dump_syntax.py script. Whatever code you generate, the test just checks if it gets displayed the same way after tracing.

See a list of the issues that fuzz testing has already found.

[donkirkby]

Added conditionals and deterministic reports to fuzz testing in 4.11.