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/slot_machine/test_block_statement.rb

@@ -1,7 +1,7 @@
 
 require_relative "helper"
 
-module Vool
+module Sol
   class TestBlockArg < MiniTest::Test
     include SlotMachineCompile
 

test/slot_machine/test_class_statement.rb

@@ -1,7 +1,7 @@
 
 require_relative "helper"
 
-module Vool
+module Sol
   class TestClassStatementSlotMachine < MiniTest::Test
     include SlotMachineCompile
 

test/slot_machine/test_method_compiler.rb

@@ -7,21 +7,21 @@ module SlotMachine
     def setup
     end
 
-    def in_test_vool(str)
-      vool = RubyX::RubyXCompiler.new(RubyX.default_test_options).ruby_to_vool(in_Test(str))
-      vool.to_parfait
-      vool.to_slot(nil)
-      vool
+    def in_test_sol(str)
+      sol = RubyX::RubyXCompiler.new(RubyX.default_test_options).ruby_to_sol(in_Test(str))
+      sol.to_parfait
+      sol.to_slot(nil)
+      sol
     end
     def create_method(body = "@ivar = 5;return")
-      in_test_vool("def meth; #{body};end")
+      in_test_sol("def meth; #{body};end")
       test = Parfait.object_space.get_class_by_name(:Test)
       test.get_instance_method(:meth)
     end
 
     def test_method_has_source
       method = create_method
-      assert_equal Vool::Statements ,  method.source.class
+      assert_equal Sol::Statements ,  method.source.class
     end
 
     def test_method_has_no_locals
@@ -37,24 +37,24 @@ module SlotMachine
     def test_creates_method_in_class
       method = create_method
       assert method , "No method created"
-      assert_equal Parfait::VoolMethod , method.class
+      assert_equal Parfait::SolMethod , method.class
     end
 
     def test_creates_method_statement_in_class
-      clazz = in_test_vool("def meth; @ivar = 5 ;return;end")
-      assert_equal Vool::Statements , clazz.body.class
-      assert_equal Vool::MethodExpression , clazz.body.first.class
+      clazz = in_test_sol("def meth; @ivar = 5 ;return;end")
+      assert_equal Sol::Statements , clazz.body.class
+      assert_equal Sol::MethodExpression , clazz.body.first.class
     end
 
     def test_callable_method_instance_type
-      in_test_vool("def meth; @ivar = 5; @ibar = 4;return;end")
+      in_test_sol("def meth; @ivar = 5; @ibar = 4;return;end")
       test = Parfait.object_space.get_class_by_name(:Test)
       method = test.instance_type.get_method(:meth)
       assert_equal 1, method.self_type.variable_index(:ivar)
       assert_equal 2, method.self_type.variable_index(:ibar)
     end
     def test_callable_method_has_one_local
-      in_test_vool("def meth; local = 5 ; a = 6;return;end")
+      in_test_sol("def meth; local = 5 ; a = 6;return;end")
       test = Parfait.object_space.get_class_by_name(:Test)
       method = test.get_instance_method(:meth)
       assert_equal 3 , method.frame_type.instance_length