Hash: add sha256-96 and sha512-96

IPSec uses them and some versions of OpenSSH use them (even though RFC6668 makes no mention of them)
It is necessary unless I rewrite it as `foreach ($tests as $i=>$test)` or `for ($i = 0; $i < count($tests); $i++)` and do `$tests[$i][1] = ...`. If you'll note in the next line I am setting `$test` equal to a modified version of itself. If I don't pass by reference and if I don't rewrite the subsequent line as well the unit test will be testing non-truncated hashes..