[svn r42] Disabled the extensive logging by default. Use the -vv flag to get it back. Fiddled a bit the the testing system. Added a very simple SDL graphics demo.

module c;

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