[svn r188] Fixed using a dereferenced pointer argument as both l- and r-value. fixes tango.io.FileRoots. Reorganized the tangotests dir a bit.

module comma;

void main()
{
    int i=0,j=0;
    for (; i<10; i++,j++)
    {
    }
    assert(i == 10);
    assert(j == 10);
}