Added a utility method to return basic and info-retrieval evaluation results as a single-instance Instances object

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka/trunk@11273 e0a1b77d-ad91-4216-81b1-defd5f83fa92
Fixed a bug in the downsampling of predictions for AUC routine

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka/trunk@11274 e0a1b77d-ad91-4216-81b1-defd5f83fa92
pom now sets property for tests

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka/trunk@11275 e0a1b77d-ad91-4216-81b1-defd5f83fa92