New 'User Attribute Packet' subpacket - vCard Subpacket (type 2)

Hello,

You can store you name, email and Photo ID in your public key, but what 
about other information? I suggest to standardize 'vCard Subpacket'. 
vCard is already known and supported format in MUAs and so the cost of 
implementing this should be minimal.

vCard Subpacket (type 2)
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Subpacket specific data:
    data - content of the vCard file


Regards,
David Srbecky

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