Rename Vool to Sol

Simple is really the descriptive name for the layer
Sure, it is "virtual" but that is not as important as the fact that it is simple (or simplified)
Also objct (based really) is better, since orientated implies it is a little like that, but only orientated, not really it. Sol only has objects, nothing else
Just cause i was renaming anyway

test/sol/class_send/test_class_send_inherited.rb

@@ -0,0 +1,45 @@
+require_relative "helper"
+
+module Sol
+  class TestClassSendInherited < MiniTest::Test
+    include SlotMachine
+    include SolCompile
+
+    def class_main
+      <<-eos
+        class Object
+          def self.one_plus()
+            return 1
+          end
+        end
+        class Space < Object
+          def main(arg)
+            return Space.one_plus
+          end
+        end
+      eos
+    end
+
+    def setup
+      ret = RubyX::RubyXCompiler.new(RubyX.default_test_options).ruby_to_slot(class_main)
+      @ins = ret.compilers.find_compiler_name(:main).slot_instructions.next
+    end
+    def test_array
+      check_array [MessageSetup,ArgumentTransfer,SimpleCall,SlotLoad,
+                    ReturnJump,Label, ReturnSequence , Label] , @ins
+    end
+    def test_receiver
+      assert_equal SlotMachine::ArgumentTransfer,  @ins.next(1).class
+      assert_equal 0,  @ins.next(1).arguments.length
+      assert_equal SlotDefinition,  @ins.next(1).receiver.class
+      assert_equal Parfait::Class,  @ins.next(1).receiver.known_object.class
+      assert_equal :Space,  @ins.next(1).receiver.known_object.name
+    end
+    def test_call
+      assert_equal SimpleCall,  @ins.next(2).class
+      assert_equal :one_plus,  @ins.next(2).method.name
+      assert_equal Parfait::Type,  @ins.next(2).method.self_type.class
+      assert_equal :"Space.Single",  @ins.next(2).method.self_type.object_class.name
+    end
+  end
+end