Refactored stats classes out of CSVToARFFHeaderMapTask into separate classes in weka.core.stats

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka@10926 e0a1b77d-ad91-4216-81b1-defd5f83fa92
Refactored stats classes out of CSVToARFFHeaderMapTask into separate classes in weka.core.stats

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka@10927 e0a1b77d-ad91-4216-81b1-defd5f83fa92
Updated for the change of packaging for Stats classes in distributedWekaBase

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka@10928 e0a1b77d-ad91-4216-81b1-defd5f83fa92
Added GPL headers

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka@10929 e0a1b77d-ad91-4216-81b1-defd5f83fa92