Refactored deletion functions for all entities since they were buggy.
They should now gather the right incident higher-dimensional entities before the deletion of an entity. Those incident higher-dim entities have to be deleted first (with descending handle index). git-svn-id: http://www.openvolumemesh.org/svnrepo/OpenVolumeMesh/trunk@228 66977474-1d4b-4f09-8fe9-267525286df2
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