Remove from TRandom integer parameter in Rndm. No more Rndm(int)
Add new MixMax version (2.0) and use differentt N, N=240, N= 17 and include also mixmamx1.0 for N=256
Improve MixMaxEngine class by adding a template N and a decimation number S (which default = 0)
Implement also in library some TRandomGen based on std engines (Mersenne-Twister 64 and Ranlux 48).