DevExp: line numbers missing in stack traces during test

[rkuhn]

When looking at test failures, it would be immensely helpful to see stack traces with line numbers, as is the default in Rust. My guess is that these are missing because in this project debug builds are supposed to be optimised enough (for some definition of enough), but I think this is a mistake. debug builds only have exactly the purpose of providing the maximum of introspection for debugging.