Java to Kotlin converter: fixed crash in converter + more correct auto insertion of !!

#KT-851 Fixed

j2k/tests/testData/ast/issues/kt-794-mixed.kt

@@ -6,6 +6,6 @@ class Test() {
     }
 
     fun test() {
-        val i = getInteger(10)!!
+        val i = getInteger(10)
     }
 }

j2k/tests/testData/ast/issues/kt-851.java

@@ -0,0 +1,9 @@
+//file
+class Test {
+    void putInt(int i) {}
+
+    void test() {
+        Byte b = 10;
+        putInt(b);
+    }
+}

j2k/tests/testData/ast/issues/kt-851.kt

@@ -0,0 +1,9 @@
+class Test() {
+    fun putInt(i: Int) {
+    }
+
+    fun test() {
+        val b = 10
+        putInt(b.toInt())
+    }
+}

j2k/tests/testData/ast/kotlinApiAccess/GlobalGenericFunction.kt

@@ -2,6 +2,6 @@ import kotlinApi.*
 
 class C() {
     fun foo() {
-        val v = globalGenericFunction<Int>(1)!!
+        val v = globalGenericFunction<Int>(1)
     }
 }

j2k/tests/testData/ast/localVariable/autoBangBang.kt

@@ -1,4 +1,4 @@
 fun foo(i: Int) {
-    var i1 = i!!
+    var i1 = i
     i1++
 }