Rename transfer’s comment to reference

Banks are using this term: Payment reference. This is more what we are aiming for.

  • Rename CLI option: silkaj money transfer -c/--comment −> -ref/--reference. -r is already used by --recipient
  • Rename UI fields of transfer and history commands
  • Adapt run time code and tests. Keep comment interface when using DuniterPy document, that’s what we won’t change.
Edited by Moul