- syncronize mathcore, mathmore, minuit2 and test/stressMathCore with development branches

- main changes are: 

-  move some remaining pdf (like	beta and landau) from mathmore to mathcore
- add missing landau_cdf
- fix a precision error with normal_cdf (and normal_cdf_c) for small x (large x). Use the correct erf or erfc function according to x
- move majority of quantiles functions from mathmore to mathcore ( implementation is based on inverse functions from Cephes, implemented in SpecFuncCephesInv.cxx) 

- add method to create Minimizer concreate classes via the plugin manager
- add possibility to use multi-dim funciton type in one dim integration

- minuit2: add some missing include cassert


git-svn-id: http://root.cern.ch/svn/root/trunk@21114 27541ba8-7e3a-0410-8455-c3a389f83636