according to https://bugs.eclipse.org/bugs/show_bug.cgi?id=544977#c21 the
scenario of using the ManifestBuilder without setting the PluginNature is
not a supported scenario. Besides, it doesn't help to get rid of the new
Eclipse warning regarding non-exported packages.
This reverts commit 063484e29f.
ssh://armin@sapsailing.com/home/trac/git into racecommittee_integrated
Conflicts:
java/com.sap.sailing.domain/src/com/sap/sailing/domain/leaderboard/impl/AbstractSimpleLeaderboardImpl.java