Estimation DLL: remove 'const' qualifiers in order to be able to put these classes in std::vector (the STL want an assignment operator)

Estimation DLL: pass the name of the dynamic MEX file through the whole hierarchy of constructors (instead of the basename of the MOD file)

C++ Estimation DLL: Adding basic Uniform and Gaussian random number generators to Priors.hh and a basic test routine

Estimation C++DLL: First draft for LogPosteriorDensity, LogPriorDensity and associated changes: random number generation still missing

                      modifying tests and adding a new test against dynare++ output (fs2000k4.mod)

Estimation DLL, generalized Schur decomposition: fix bug with complex part of infinite generalized eigenvalue (was NaN instead of zero)

Estimation DLL: no longer pass lead/lag incidence matrix as argument, this is redundant with the zeta indices