Use hash-bashed file names in edit_note()

Note file names are now generated based on their content. Items using
the same note will share a single note file.

Please note that this implies a few changes:

* Both random-style and hash-style note files need to be handled to
  ensure we do not break backwards compatibility.

* Note files may not be moved or deleted if a note is changed or removed
  since the original note file might be used by another item as well.

* A garbage collector to remove unreferenced note files needs to be
  implemented.

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

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