Test data fixed

Useless code removed
Some naming refactored

idea/testData/checker/Constructors.jet

@@ -23,7 +23,7 @@ class WithPC1(a : Int) {
 
   this(s : String) : this(1) {}
 
-  this(b : Char) : this<error>("", 2)</error> {}
+  this(b : Char) : <error>this("", 2)</error> {}
 
   this(b : Byte) : this(""), <error>this(1)</error> {}
 }

idea/testData/checker/ExtensionFunctions.jet

@@ -47,6 +47,7 @@ namespace null_safety {
 
         fun Any.equals(other : Any?) : Boolean
         fun Any?.equals1(other : Any?) : Boolean
+        fun Any.equals2(other : Any?) : Boolean
 
         fun main(args: Array<String>) {
 
@@ -62,7 +63,7 @@ namespace null_safety {
             command<warning>?.</warning>equals1(null)
 
             val c = Command()
-            c<warning>?.</warning>equals(null)
+            c<warning>?.</warning>equals2(null)
 
             if (command == null) 1
         }

idea/testData/checker/QualifiedThis.jet

@@ -16,7 +16,7 @@ class A() {
   val z = foo()
 }
 
-fun foo() : Unit {
+fun foo1() : Unit {
   <error>this</error>
   this<error>@a</error>
 }

idea/testData/checker/ResolveToJava.jet

@@ -22,7 +22,7 @@ fun test(l : java.util.List<Int>) {
   Collections.emptyList()
 
   Collections.singleton<Int>(1) : Set<Int>?
-  Collections.singleton<Int><error>(1.0)</error>
+  Collections.singleton<Int>(<error>1.0</error>)
 
   <error>List</error><Int>