Finish remove user implementation

msql_acces.h

@@ -19,6 +19,7 @@ public:
   void write_remove(std::string);
   bool get_package_exists(std::string package);
   void create_user(std::string user, std::string pass, bool admin);
+  void remove_user(std::string user);
 private:
   sql::Connection *con;
   sql::Driver *driver;