Rename Vool Block to Lambda

Making the distinction clearer
Some fixing of previous (wip)

lib/ruby/assignment.rb

@@ -13,7 +13,7 @@ module Ruby
         return self.vool_brother.new(name,@value.to_vool)
       when SendStatement , YieldStatement
         return normalize_send
-      when BlockStatement
+      when RubyBlockStatement
         return normalize_block
       else
         raise "unsupported right #{value}"

lib/ruby/method_statement.rb

@@ -27,7 +27,7 @@ module Ruby
       when LocalAssignment
         ret = ReturnStatement.new( LocalVariable.new(statement.name) )
         return Statements.new([statement , ret])
-      when ReturnStatement , IfStatement , WhileStatement ,BlockStatement
+      when ReturnStatement , IfStatement , WhileStatement ,RubyBlockStatement
         return statement
       else
         raise "Not implemented implicit return #{statement.class}"

lib/ruby/ruby_block_statement.rb

@@ -20,7 +20,7 @@ module Ruby
     #
     def to_vool
       block_name = "implicit_block_#{object_id}".to_sym
-      block = Vool::BlockStatement.new( @args.dup , @body.to_vool)
+      block = Vool::LambdaStatement.new( @args.dup , @body.to_vool)
       assign = Vool::LocalAssignment.new( block_name , block)
       sendd = @send.to_vool
       if(sendd.is_a?(Vool::Statements))