Made a stripped down version of SimpleLinearRegression and placed it into the lmt package. This is now used by LogisticBase and LMTNode to improve runtime and memory consumption.

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka/trunk@10401 e0a1b77d-ad91-4216-81b1-defd5f83fa92
Merge remote-tracking branch 'upstream'