Changed the organization of the description of the function prange to make it easier for readers to jump to the information that they want.

Adding tests for "Unicode and passing strings" part 7

Adding tests for "Unicode and passing strings" part 8

Adding tests for "Unicode and passing strings" part 6

docs: Give the string input conversion function in the string tutorial a better name and clarify some comments.

Adding tests for "Unicode and passing strings" part 5

Adding tests for "Unicode and passing strings" part 3

Adding tests for "Unicode and passing strings" part 2

Adding tests for "pure python mode" part 11

Adding tests for "pure python mode" part 10

Adding tests for "pure python mode" part 9

Adding tests for "pure python mode" part 8

Adding tests for "Basic tutorial"

Added tests to "Using Parallelism" part 1

Added tests to "Memoryviews" part 1

Added tests to "Fused types (templates)" part 1

Added tests to "Interfacing with external C code" part 1

Added tests to "Implementing the buffer protocol" part 1

See #2362.

Enhance "wrapping C libraries".

Added tests to "Early binding for speed" part 1