KT-286 Check supertype lists (in progress)

Tests involving multiple inheritance fixed

idea/testData/checker/MultipleBounds.jet

@@ -4,14 +4,14 @@ open class A() {
   fun foo() : Int = 1
 }
 
-open class B() {
+trait class B {
   fun bar() : Double = 1.0;
 }
 
-class C() : A(), B()
+class C() : A(), B
 
 class D() {
-  class object : A(), B () {}
+  class object : A(), B {}
 }
 
 class Test1<T : A>()
@@ -61,7 +61,7 @@ fun <T : A> test2(t : T)
 }
 
 val t1 = test2<<error>A</error>>(A())
-val t2 = test2<<error>B</error>>(B())
+val t2 = test2<<error>B</error>>(C())
 val t3 = test2<C>(C())
 
 class Test<<error>T</error>>