Re-applied rotation to subentities, which was taken away on r5639, Not applying rotation effectively disables the rotational_velocity shipdata attribute.

git-svn-id: http://svn.berlios.de/svnroot/repos/oolite-linux/trunk@5688 127b21dd-08f5-0310-b4b7-95ae10353056
Reverted the oops of the previous commit and applied correct fix to subentities rotational_velocity issue as per cim's suggestion.

git-svn-id: http://svn.berlios.de/svnroot/repos/oolite-linux/trunk@5689 127b21dd-08f5-0310-b4b7-95ae10353056
Merge branch 'svn-integration' into maintenance/1.77