{* *! version 1.0.0  25oct2007}{...}
    {cmd:issymmetric(}{it:M}{cmd:)}
{p2colset 8 22 26 2}{...}
{p2col: Domain:}matrices{p_end}
{p2col: Range:}integers 0 and 1{p_end}
{p2col: Description:}returns {cmd:1} if the matrix is symmetric; otherwise,
                       returns {cmd:0}.
{p2colreset}{...}
