src: add alternative API to set up packet buffer

pktb_setup_raw() is a new function to initialise a new struct pkt_buff.
It takes the memory area to be used to store pkt_buff structure and the
data. Data is attached to the packet buffer (not copied), ie. the packet
buffer data points to the provided data pointer.

pktb_head_size() is a new function to return the amount of memory to
reserve for a new struct pkt_buff.

Extend documentation pon pktb_alloc().

Mostly original patch from Duncan Roe <duncan_roe@optusnet.com.au>.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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