Minor Release

• IMPROVE: as.list.Node
  • now generates auto name if unique name is not available (#54)
  • now has warn arg, warning if source data contains reserved names
  • now also imports fiels with names equal to reserved names (e.g. count), they will be renamed (to e.g. count2)
• CHANGE: node$leaves now returns a list even when called on a leaf itself
• ADD: Find method to find a single Node in a (sub-)tree (#52)