Import export hnb (file_hnb.c)

Import/export hnb (file_hnb.c)

• export_hnb <filename>
  Exports the current entries, and following entries on the same level, in hnb format.
• export_hnb_branch <filename>
  Exports the current entry and all sub-entries in hnb format.
• import_hnb <filename>
  Imports an hnb file below the current node.