wrote tests for ckw2 and ckw3, and for various daf functions.
attempt to fix failure on travis, appeared to be the dafgs function, which would randomly fail due to improper dynamic array stuff, set a fixed ctypes array size to 125 which appears to have solved failures observed in stress test function (test_dafgsstress) which would fail every time without.
Merge pull request #34 from Apollo117/ckw_and_daf_tests

wrote tests for ckw2 and ckw3, and for various daf functions.