Logging

To use the Logger class include Logger.h

You can then choose to manage your own Logger instance(s) for applicable parts
of your program. OR, you can call Util::Logger::initMainLogger(Logger*) and the
provided Logger will be accesible as the macro MAIN_LOGGER. 

The constructor of Logger is documented as:

 /* @param fileName The log file
 * @param level Only messages with log-level lower than or equals to level will be logged
 * @param timestampEnabled If true, a timestamp will be pre-fixed in every log message
 */
Logger(const std::string &fileName = "logFile.txt", int level = FINE, bool timestampEnabled = true);

All loggers can log to logFile.txt - the messages will just be interleaved, but
you may want say individual mind agents to have their own log files.

level is one of:
        static const int ERROR = 0;
        static const int WARNING = 1;
        static const int INFO = 2;
        static const int DEBUG = 3;
        static const int FINE = 4;
defined in Util::Logger.

You can also enable() and disable() the log.

The method setPrintToStdoutFlag(bool flag) is useful for getting the Logger to
print to stdout. Loggers don't do this by default.