Fixed a bug where the code that creates the DatabaseLoader component when the new flow button is pressed got accidently commented out.

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka/trunk@11286 e0a1b77d-ad91-4216-81b1-defd5f83fa92
Removed bartMachine from MLRClassifier again because I failed to get it to work on my machine using MLRClassifier. BartMachine works fine if I start it from R, but there is a problem when running it from MLRClassifier, at least in my environment.

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka/trunk@11288 e0a1b77d-ad91-4216-81b1-defd5f83fa92
Improvements courtesy of Scott Turner

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka/trunk@11289 e0a1b77d-ad91-4216-81b1-defd5f83fa92
Changes to SimpleKMeans to improve runtime and a couple of small fixes to SimpleKMeans and EM to fix behaviour for weighted data.

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka/trunk@11290 e0a1b77d-ad91-4216-81b1-defd5f83fa92
Small bug fix in modified version: median should not be computed for nominal attributes.

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka/trunk@11292 e0a1b77d-ad91-4216-81b1-defd5f83fa92
Removed a single usage of Instances.attributeStats() for speed reasons.

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka/trunk@11294 e0a1b77d-ad91-4216-81b1-defd5f83fa92
Replaced computation of standard deviation via calls to attributeStats() with calls to Instances.variance().

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka/trunk@11296 e0a1b77d-ad91-4216-81b1-defd5f83fa92
Added method to compute multiple variances simultaneously in Instances. This method is now used in SimpleKMeans. Rearranged loops, removed testing for missing values, and made some other small modifications in EM. EM now also has a parameter that allows the user to specify the number of k-means runs to perform for initialization.

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka/trunk@11298 e0a1b77d-ad91-4216-81b1-defd5f83fa92