More mathcore classes for which THtml should use the source files.

After the release, this list of classes will be replaced by a new exclusion of the Fit and Math subdirectories, instead of excluding all of mathcore's source files.


git-svn-id: http://root.cern.ch/svn/root/trunk@37478 27541ba8-7e3a-0410-8455-c3a389f83636