Align all project versions to JavaSE-1.6

bndtools.core was already 1.6 for a long while so there is no point
in sticking to 1.5 for other bndtools projects

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
Let all projects use the same eclipse settings

Now that all JDK compliance levels are the same

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>