ref #6913 Remove org.eclipse.ui dependency from NavigationUtil
fix #6961 fix further NPEs in TreeNodeDropAdapter and TreeNodeDropAdapterAssistant
fix #6961 fix further potential NPEs in TreeNodeDropAdapter and TreeNodeDropAdapterAssistant and cleanup
fix #6961 fix NPE for TaxonNode d&d when hovering classification
ref #4611 i18n for taxeditor.navigator plugin
Cleanup
smaller changes for drag & dop with natural order in taxonnavigator
fix move taxonnode in natural order
moving taxonnode with drag & drop as predecessor fixed
moving more than one taxon node, merge of team and person, reusing name for new taxon
small changes for ideas for better drag and drop in taxonnavigator