Prefer logical punctuators instead of named operator keywords

Some compilers (eg. MSVC) still require inclusion of <ciso646>
in order to import named operator keywords.
It is easier to stick with traditional punctuators.

include/util/guidance/entry_class.hpp

@@ -64,7 +64,7 @@ class EntryClass
     friend std::size_t std::hash<EntryClass>::operator()(const EntryClass &) const;
 };
 
-#if not defined __GNUC__ or __GNUC__ > 4
+#if !defined(__GNUC__) || (__GNUC__ > 4)
 static_assert(std::is_trivially_copyable<EntryClass>::value,
               "Class is serialized trivially in "
               "the datafacades. Bytewise writing "