KT-1717 Don't make member visibility inherit when it is not declared explicitly

#KT-1717 Fixed

compiler/testData/diagnostics/tests/PrimaryConstructors.jet

@@ -18,12 +18,12 @@ class Z : Y() {
 
 class MyIterable<T> : Iterable<T>
 {
-    override fun iterator(): Iterator<T>  = MyIterator()
+    public override fun iterator(): Iterator<T>  = MyIterator()
 
     class MyIterator : Iterator<T>
     {
-        override val hasNext: Boolean = false
-        override fun next(): T {
+        public override val hasNext: Boolean = false
+        public override fun next(): T {
             throw UnsupportedOperationException()
         }
     }

compiler/testData/diagnostics/tests/extensions/GenericIterator.jet

@@ -1,10 +1,10 @@
 import java.util.Enumeration
 
 inline fun <T> java.util.Enumeration<T>.iterator() = object: Iterator<T> {
-  override val hasNext: Boolean
+  public override val hasNext: Boolean
     get() = hasMoreElements()
 
-  override fun next() = nextElement()
+  public override fun next() = nextElement()
 }
 
 fun a(e : java.util.Enumeration<Int>) {

compiler/testData/diagnostics/tests/regressions/kt588.jet

@@ -6,7 +6,7 @@ class Test() : Thread("Test") {
 
         }
     }
-    override fun run() {
+    public override fun run() {
         init2()      // unresolved
         Test.init2() // ok
     }

compiler/testData/diagnostics/tests/scopes/visibility2.jet

@@ -38,7 +38,7 @@ class Q {
     }
 }
 
-//check that 'toString' can be invoked without specifying 'public' and ': String'
+//check that 'toString' can be invoked without specifying return type
 class NewClass : java.util.ArrayList<Integer>() {
-    override fun toString() = "a"
+    public override fun toString() = "a"
 }

compiler/testData/diagnostics/tests/scopes/visibility_inherit_modifier.jet

@@ -18,7 +18,7 @@ open class D {
 }
 
 class E : D() {
-    internal override fun self() = this
+    internal <!NOTHING_TO_OVERRIDE!>override<!> fun self() = this
 
     fun test() {
         val <!UNUSED_VARIABLE!>s<!> : E = self()
@@ -31,11 +31,7 @@ open class F {
 }
 
 class G : F() {
-    override fun protected_fun() {}
-}
-
-fun test_fun_stays_protected(g: G) {
-    g.<!UNRESOLVED_REFERENCE!>protected_fun<!>()
+    <!CANNOT_CHANGE_ACCESS_PRIVILEGE!>override<!> fun protected_fun() {}
 }
 
 //------------
@@ -61,11 +57,11 @@ trait T {
 }
 
 open class L : T {
-    override fun foo() {}
+    <!CANNOT_WEAKEN_ACCESS_PRIVILEGE!>override<!> fun foo() {}
 }
 
 class M : L() {
-    <!CANNOT_WEAKEN_ACCESS_PRIVILEGE!>internal<!> override fun foo() {}
+    internal override fun foo() {}
 }
 //---------------
 trait R {
@@ -82,4 +78,4 @@ trait Q : R {
 
 class S : P, Q {
     <!CANNOT_CHANGE_ACCESS_PRIVILEGE!>internal<!> override fun foo() {}
-}
+}