Fixed compiler warnings detected by option -Wshadow and -Wunused:

- Removed not used variables and functions
- Added #ifdef around code that is not used
- Renamed variables and functions to avoid conflicts
- Removed some not used arguments

Fixed some class/struct warnings in ndb
Added define IS_LONGDATA() to simplify code in libmysql.c

I did run gcov on the changes and added 'purecov' comments on almost all lines that was not just variable name changes

server-tools/instance-manager/options.h

@@ -53,6 +53,7 @@ struct Options
   static char **saved_argv;
 
   int load(int argc, char **argv);
+  Options() {}
   void cleanup();
 #ifdef __WIN__
   int setup_windows_defaults();