[Orgmode] [patch] org-id: New org-id-method 'uuid' w/ elisp function that creates random uuid

[David Maus]

Attached patch for org-id adds a new function `org-id-uuid' that
returns a random (version 4) uuid following the format and suggestions
in RFC 4122:

  - it collects some random, system ans user specific data

  - creates a md5 hash for this data to obtain the require 32 octets

  - flips the correct bits to indicate a random uuid

Using the elisp method to create a random uuid can be customized by
setting `org-id-method' to 'uuid.

In addition `org-id-new' throws an error when the call to
`org-id-uuid-program' returns something that does not look like a
uuid.[1]

HTH
 -- David


[1] Sorry, this should have been a patch on its own.

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