tracer class improvements [1.5.0]

This version introduces multiple enhancements:

changed visibility of tracer data to make more readable and fixed data div width

Details of additions/deletions below:
--------------------------------------------------------------

Modified:   /BLUE_FRAMEWORK/packages/tester/tracer_class.php
            -- Added --
                $_divStyles to keep data div styles
            -- Updated --
                display, changed some default view, apply usage of _divStyles