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_assignment.rb

@@ -25,46 +25,46 @@ module Ruby
       assert_equal IvarAssignment , lst.class
     end
   end
-  class TestAssignmentVoolLocal < MiniTest::Test
+  class TestAssignmentSolLocal < MiniTest::Test
     include RubyTests
     def setup
-      @lst = compile( "foo = bar").to_vool
+      @lst = compile( "foo = bar").to_sol
     end
     def test_tos
       assert_equal "foo = self.bar()" , @lst.to_s
     end
     def test_local
-      assert_equal Vool::LocalAssignment , @lst.class
+      assert_equal Sol::LocalAssignment , @lst.class
     end
     def test_bar
-      assert_equal Vool::SendStatement , @lst.value.class
+      assert_equal Sol::SendStatement , @lst.value.class
     end
     def test_local_name
       assert_equal :foo , @lst.name
     end
   end
-  class TestAssignmentVoolInst < MiniTest::Test
+  class TestAssignmentSolInst < MiniTest::Test
     include RubyTests
     def setup
-      @lst = compile( "@foo = bar").to_vool
+      @lst = compile( "@foo = bar").to_sol
     end
     def test_tos
       assert_equal "@foo = self.bar()" , @lst.to_s
     end
     def test_instance
-      assert_equal Vool::IvarAssignment , @lst.class
+      assert_equal Sol::IvarAssignment , @lst.class
     end
     def test_instance_name
       assert_equal :foo , @lst.name
     end
   end
-  class TestAssignmentVoolConst < MiniTest::Test
+  class TestAssignmentSolConst < MiniTest::Test
     include RubyTests
     def setup
-      @lst = compile( "foo = 5").to_vool
+      @lst = compile( "foo = 5").to_sol
     end
     def test_const
-      assert_equal Vool::IntegerConstant , @lst.value.class
+      assert_equal Sol::IntegerConstant , @lst.value.class
     end
   end
 end