add checkSquareStochastic function to sql mdp
add checkSquareStochastic function to sql mdp

yasserglez/pymdptoolbox,silgon/pymdptoolbox,McCabeJM/pymdptoolbox,McCabeJM/pymdptoolbox,sawcordwell/pymdptoolbox,sawcordwell/pymdptoolbox,yasserglez/pymdptoolbox,silgon/pymdptoolbox