[svn r54] Added support for nested delegates referencing parent's stack variables. Replaced tester.sh with a version written in D. A few bugfixes.

module c;

void main()
{
    ushort a = 0xFFF0;
    ushort b = 0x0FFF;
    auto t = a & b;
    a &= b;
    assert(t == a);
}