Fix broken include guards

include/rtg/argument.hpp

-#ifndef GUARD_RTGLIB_ARGUMENT_HPP
+#ifndef RTG_GUARD_RTGLIB_ARGUMENT_HPP
 #define RTG_GUARD_RTGLIB_ARGUMENT_HPP
 
 #include <rtg/shape.hpp>

include/rtg/float_equal.hpp

-#ifndef GUARD_RTGLIB_FLOAT_EQUAL_HPP
+#ifndef RTG_GUARD_RTGLIB_FLOAT_EQUAL_HPP
 #define RTG_GUARD_RTGLIB_FLOAT_EQUAL_HPP
 
 #include <algorithm>

include/rtg/instruction.hpp

-#ifndef GUARD_RTGLIB_INSTRUCTION_HPP
+#ifndef RTG_GUARD_RTGLIB_INSTRUCTION_HPP
 #define RTG_GUARD_RTGLIB_INSTRUCTION_HPP
 
 #include <rtg/literal.hpp>

include/rtg/literal.hpp

-#ifndef GUARD_RTGLIB_LITERAL_HPP
+#ifndef RTG_GUARD_RTGLIB_LITERAL_HPP
 #define RTG_GUARD_RTGLIB_LITERAL_HPP
 
 #include <rtg/shape.hpp>

include/rtg/operand.hpp

-#ifndef GUARD_RTGLIB_OPERAND_HPP
+#ifndef RTG_GUARD_RTGLIB_OPERAND_HPP
 #define RTG_GUARD_RTGLIB_OPERAND_HPP
 
 #include <string>

include/rtg/program.hpp

-#ifndef GUARD_RTGLIB_PROGRAM_HPP
+#ifndef RTG_GUARD_RTGLIB_PROGRAM_HPP
 #define RTG_GUARD_RTGLIB_PROGRAM_HPP
 
 #include <list>

include/rtg/shape.hpp

-#ifndef GUARD_RTGLIB_SHAPE_HPP
+#ifndef RTG_GUARD_RTGLIB_SHAPE_HPP
 #define RTG_GUARD_RTGLIB_SHAPE_HPP
 
 #include <vector>

include/rtg/stringutils.hpp

-#ifndef GUARD_RTGLIB_STRINGUTILS_HPP
+#ifndef RTG_GUARD_RTGLIB_STRINGUTILS_HPP
 #define RTG_GUARD_RTGLIB_STRINGUTILS_HPP
 
 #include <algorithm>

test/test.hpp

@@ -4,7 +4,7 @@
 #include <cstdlib>
 #include <iostream>
 
-#ifndef GUARD_TEST_TEST_HPP
+#ifndef RTG_GUARD_TEST_TEST_HPP
 #define RTG_GUARD_TEST_TEST_HPP
 
 inline void failed(const char* msg, const char* file, int line)