-Refactored SLI algorithm from AutoGaitModelerAnalyser's
hasStraightLine() method into GPSSegment, where it belongs;
-Created AutoGaitModelerAnalyser constructor that allows to
activate/deactivate GPSReading smoothing;
-Changed GPSSegment to accomodate smoothed reading Heading Change
accumulation and SLI;
-Assorted commenting and refactoring;