[dcc2] Multi headers + metadata

[peter green]

These come to mind:

content-type
i don't see the point as we are senidng files and neither windows nor linux
has content types at the filesystem level

executable bit
*bad* idea you do not wan't to make it easy to open the trojan you were
dcc'd by a zombie

md5 hash
do we really need 2 different hashing systems

sha1 hash
yeah good idea

description
yep good idea

note
seems a bit redundent with description

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