- sync. with dev branch (revision 20719) mathcore, unuran, minuit2

- fix coding convention in mathcore and minuit2
- fix problem with interpreted TF1 in unuran and tutorial
- add implementation of Minimizer interface in Minuit2


git-svn-id: http://root.cern.ch/svn/root/trunk@20720 27541ba8-7e3a-0410-8455-c3a389f83636