minor
add possibility to mark and delete more than one taxonNode
fix #7069: use the same configurator for deleting a taxon node with or without children
Merge branch 'develop' into bulkEditorE4
ref #6598 refactore method signature for remote handlers
ref #6598 Fix menu item visibility
ref #6909 Implement canExecute() for remoting handler
ref #6909 Migrate remote handler