Library-function test-driver

[Artoria2e5]

The current test driver is based on string (usually stdout and argv) I/O and is not quite convenient to call from more restrictive environments such as iOS. A graphics environment might also want to display the results without too much string manipulation. A more "struct-ured" (pardon my pun) API taking a struct input (multithread, seed) and a struct output (anything printed) might be more adequate and portable. core_results is 90% there already.

[Artoria2e5]

The less intrusive way is to redirect main and ee_printf. Basically the caller calls the renamed core_main supplying argc and argv, then retrieve the result from a global buffer that the new printf writes to.

This can be achieved without modifying the 5 core files -- ifdef is enough to rename main(). The makefile still needs to be taken down and rewritten.