implement assignment normalisation

especially when the value is a send that needs normalising
fixes several broken tests

test/risc/methods/test_call_fibo.rb

@@ -3,7 +3,26 @@ require_relative 'helper'
 module Methods
   class TestFibo < MethodsTest
 
-    def est_ruby_adds
+    def test_count_down
+      run_space <<HERE
+      def down( n )
+        if( n <  2 )
+          return n
+        else
+          a = down(n - 1)
+          return a
+        end
+      end
+
+      def main(arg)
+        return down(8)
+      end
+HERE
+      assert_equal Parfait::Integer , get_return.class
+      assert_equal 1 , get_return.value
+    end
+
+    def est_fibo
       run_space <<HERE
       def fibo_r( n )
         if( n <  2 )

test/risc/methods/test_call_simple.rb

@@ -3,17 +3,31 @@ require_relative 'helper'
 module Methods
   class TestCallSimple < MethodsTest
 
-    def test_call
+    def test_simple
       run_space <<HERE
-      def called( n )
+      def same( n )
         return n
       end
       def main(arg)
-        return called(8)
+        return same(8)
       end
 HERE
       assert_equal Parfait::Integer , get_return.class
       assert_equal 8 , get_return.value
     end
+
+    def test_call_with_call
+      run_space <<HERE
+      def same( n )
+        return n
+      end
+      def main(arg)
+        a = same(8 - 1)
+        return a
+      end
+HERE
+      assert_equal Parfait::Integer , get_return.class
+      assert_equal 7 , get_return.value
+    end
   end
 end