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/ruby/test_ruby_block_statement1.rb

@@ -24,28 +24,28 @@ module Ruby
       assert_equal ReturnStatement , @lst.last.class
     end
   end
-  class TestBlockReturnVool < MiniTest::Test
+  class TestBlockReturnSol < MiniTest::Test
     include RubyTests
     def setup()
       input = "a = plus_one{return 1 } ; return a "
-      @lst = compile( input ).to_vool
+      @lst = compile( input ).to_sol
     end
     def test_scope
-      assert_equal Vool::ScopeStatement , @lst.class
+      assert_equal Sol::ScopeStatement , @lst.class
     end
     def test_assign
-      assert_equal Vool::LocalAssignment , @lst.first.class
+      assert_equal Sol::LocalAssignment , @lst.first.class
       assert_equal :a ,  @lst.first.name
     end
     def test_send
-      assert_equal Vool::SendStatement , @lst.first.value.class
+      assert_equal Sol::SendStatement , @lst.first.value.class
       assert_equal :plus_one , @lst.first.value.name
     end
     def test_block_arg
-      assert_equal Vool::LambdaExpression , @lst.first.value.arguments.first.class
+      assert_equal Sol::LambdaExpression , @lst.first.value.arguments.first.class
     end
     def test_ret
-      assert_equal Vool::ReturnStatement , @lst[1].class
+      assert_equal Sol::ReturnStatement , @lst[1].class
     end
   end
 end