avoided some unneeded conversions of string::npos, minor cleanup of className

- string doesn't use any debug info, remove it
- restructured the macros to add in NoDebug macro versions to className,
  typeInfo.  Might be helpful with tackling the globals bootstrapping issue.
- HashTableName + StaticHashTableName - avoid lookup of debug switch when
  FULLDEBUG is not defined

src/OpenFOAM/primitives/strings/string/string.H

@@ -80,8 +80,6 @@ public:
 
     // Static data members
 
-        static const char* const typeName;
-        static int debug;
         static const string null;