MODE-2013 Added the simpler API logger to Connector 

The Connector base class now has a 'log()' method that returns the simpler API Logger class with methods that take only String parameters (rather than I18n messages used in the internal logger). The internal logger is still available via the existing and unchanged 'getLogger()' method. JavaDoc explains the differences between the two.
    
Also includes a separate commit that corrects quite a few compiler warnings.