+ Moved functions located in ./distribution to ./distributions/toolbox
+ Moved distribution related functions to ./distributions
git-svn-id: https://www.dynare.org/svn/dynare/dynare_v4@2055 ac1d8469-bf42-47a9-8791-bf33cf982152
* replaced CDF, PDF, quantile functions of the gamma by a GPL'd one
* replaced quantile function of the chi-square by a GPL'd one
git-svn-id: https://www.dynare.org/svn/dynare/dynare_v4@1981 ac1d8469-bf42-47a9-8791-bf33cf982152
* replaced dnorm, pnorm and qnorm by GPL alternatives in distributions/
* only add distributions/ to the path if under Matlab without Statistics toolbox
git-svn-id: https://www.dynare.org/svn/dynare/dynare_v4@1979 ac1d8469-bf42-47a9-8791-bf33cf982152