[Click] fromuserdevice patch

[Eddie Kohler]

Thanks, Roman, this is applied as well, with two changes.

- _headroom defaults to Packet::default_headroom
- documented HEADROOM in the header file -- please keep element documentation 
up to date

Eddie


Roman Chertov wrote:
> Hello Eddie,
> 
> This patch will add the ability to use HEADROOM parameter in 
> FromUserDevice element.  This is quite useful if you write IPv4 packets 
> into /dev/toclick0 device, and you want to encapsulate them in IPv6 in 
> Click.
> 
> Roman
> 
> 
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