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- add a new function TMath::Power(double, int) impelmented using std::pow(double,int) since it is 100% faster

- fix for new Power function some code in TMVA 

- Fix in TMath implementation of IsNaN for the latest C++ compiler when used together with cmath 
  see https://savannah.cern.ch/bugs/?87534


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Part of Savannah #86223.


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a couple of minor changes to make standalone compilation of TMVA and RooFit
work.


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Introduce alternative cmake based build system. Cmake is especially convenient
for building on Windows, as it can produce VC projects or nmake files and 
does not require cygwin to be installed. In addition on OSX Xcode projects
can be generated.


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mantain in tmva/inc only the LinkDef files

update Module.mk for the new header files position


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