Use webkit 2 by default, webkit 1 can still be used by setting SWT_WEBKIT2=0
    
      in the environment, rhbz#1303912
    - Ignore SWT.MOZILLA style when creating a browser widget and always use webkit
      because we cannot ship xulrunner support, rhbz#1210898
    - Drop unneeded requires from tests package
    - Add missing R on eclipse-filesystem to low-level sub-packages