* Added cl_half support for test_select (issue #142, select)
* Added corrections due to code review + performance optimization + replaced C object with wrappers
* minor fix
* Corrected use of user event
* Removed unnecessary user event
* Use memcmp for select verification.
If memcmp fails, fall back to looping through the result buffer to find the incorrect result.
* Removed extra prints for check_int.
