Code issues in the book

[BjarkeHautop]

Here are some code issues in the book:

• Chapter 5 & 6: The book only has 1 thread when the book renders. Thus, the examples about speed, race conditions, quasi-random ordering, etc., don't work. This makes it confusing when looking at the code output in the book (and the text around it doesn't match the observed output from the code).

• Chapter 6: When using CUDA, it gives the error "ERROR: The following 1 direct dependency failed to precompile: CUDA" in the book.

• Chapter 17: When generating Sobol sequence it gives the error "ERROR: invalid redefinition of constant Main.s".

• Chapter 19: When using IntervalArithmetic the book says "or using the shorthand 0.1..0.2" which returns "ERROR: UndefVarError: .. not defined in Main" (and later also when calling h(3..4)).

[ChrisRackauckas]

Yeah we need to setup the book with a different runner for the first two. The first versions I had ran it locally, so it had threads and a GPU, but the Github actions don't 😅. The other two errors are simple to handle though.