Log4J 2.x support has been introduced:
 - The default logger named as 'org.rododin.algorithms' logs at the 'info' by default. So, the 'debug', 'trace' and 'all' levels are disabled for it and all its descendants if not redefined.
 - However appropriate loggers have been introduced for each of the standard Log4J log levels (named as 'org.rododin.algorithms.LogAll', 'org.rododin.algorithms.LogTrace', 'org.rododin.algorithms.LogDebug', etc.). They allow to log at their levels always independently to the settings configured for other loggers.
 - Two logging appenders have been introduced to be used by default: the STDOUT and FILEOUT ones. The first one prints-out to the system console (STDOUT stream), and the second one writes to the 'algorithms.log' file located in the app working directory.
 - The ConnectivityProblem app has been moved on Log4J to be used instead of 'System.out/err'.
 - PLEASE NOTE: Any other apps and modules should always use the introduced Log4J support instead of 'System.out/err'.