[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 with1;
struct S
{
    int i;
    float f;
}
void main()
{
    S s;
    with(s)
    {
        i = 0;
        f = 3.4;
    }
}