Optimize sha256-opencl further.
Fix an error in sha256crypt-opencl. Now it passes JtR-TestSuite.
Small tweaks.
Increase HASH_LOOPS for sha256crypt-opencl.
Remove commented code.
Autotune for sha256crypt-opencl (it is fast enough).
Merge pull request #744 from claudioandre/bleeding-jumbo

Clean sha256crypt-opencl code.