Changed method argument back from Vector<?> to Vector because of an incompatibility between Java 6 and 7.

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka@10219 e0a1b77d-ad91-4216-81b1-defd5f83fa92
Further code cleanup.

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka@10220 e0a1b77d-ad91-4216-81b1-defd5f83fa92