function toggleSelection(oPlugin) {
		if (oPlugin.getSelectableCount() > oPlugin.getSelectedCount()) {
			oPlugin.selectAll();
			return true;
		} else {
			oPlugin.clearSelection();
			return false;
		}
	}
If not all indices are selected, all indices are selected, otherwise the selection is removed.

@param {sap.ui.table.plugins.MultiSelectionPlugin} oPlugin The plugin to toggle the selection on.
@returns {boolean} The selection state. true - all selected, false - all cleared