compare hawc2 test cases + tests

wetb/hawc2/cmp_test_cases.py

wetb/hawc2/tests/test_compare_test_cases.py

wetb/hawc2/tests/test_files/cmp_test_cases/ref/test1.dat

wetb/hawc2/tests/test_files/cmp_test_cases/ref/test1.sel

wetb/hawc2/tests/test_files/cmp_test_cases/ref/test2.sel

wetb/hawc2/tests/test_files/cmp_test_cases/ref/test3.dat

wetb/hawc2/tests/test_files/cmp_test_cases/ref/test3.sel

wetb/hawc2/tests/test_files/cmp_test_cases/ref/test4.sel

wetb/hawc2/tests/test_files/cmp_test_cases/test1/test1.dat

wetb/hawc2/tests/test_files/cmp_test_cases/test1/test1.sel

wetb/hawc2/tests/test_files/cmp_test_cases/test1/test2.sel

wetb/hawc2/tests/test_files/cmp_test_cases/test1/test3.dat

wetb/hawc2/tests/test_files/cmp_test_cases/test1/test3.sel

wetb/hawc2/tests/test_files/cmp_test_cases/test1/test4.sel