Cleaned up option handling and removed warnings.

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka@10215 e0a1b77d-ad91-4216-81b1-defd5f83fa92
Further elimination of compilation warnings.

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka@10216 e0a1b77d-ad91-4216-81b1-defd5f83fa92