Added proper "need 'this' to access member foo" errors instead of "variable foo not resolved" for some cases, added FIXME for the old error! Added a bit more information to the runtime's cyclic dependency detection exception.

module bug66;
import std.stdio;
class Scene { string name() { return "Scene"; } }
class Group : Scene { this () { } }
void main() { writefln((new Group).name); }