Add unit test for ROCEvaluation
as currently this little example fails
replaced assert by proper error message
added method name to error messages and re-formated
made set_cont to affect values/scores 
allocate value memory
add values to parameters
made unit-test work
Merge pull request #985 from karlnapf/develop

Fixed ROC unit test
replaced variable-length array with SG_MALLOC in log_det_test_3
Merge pull request #986 from lambday/develop

replaced variable-length array with SG_MALLOC in log_det_test_3
removed assertions and print probabilities
added unit test for sigmoid fitting
Merge pull request #988 from karlnapf/develop

unit test for binary label sigmoid fitting