Fixed a bug where if the user specified the class attribute by name it wouldn't handle names with spaces in them

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka@10385 e0a1b77d-ad91-4216-81b1-defd5f83fa92
Discretization is now (again) only performed when necessary. This also fixed the bug I introduced in the last change.

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka@10386 e0a1b77d-ad91-4216-81b1-defd5f83fa92
From Eibe: Discretization is now (again) only performed when necessary. This also fixed the bug I introduced in the last change.

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka@10387 e0a1b77d-ad91-4216-81b1-defd5f83fa92
Javadoc update

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka@10388 e0a1b77d-ad91-4216-81b1-defd5f83fa92
Some small code improvements proposed by Rosjier Lammers, Waikato Summer Intern.

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka@10389 e0a1b77d-ad91-4216-81b1-defd5f83fa92