- add netmap-libpcap

- add netmap (FreeBSD header files need to be updated with this)
- move prototype perl scripts to prototype/ folder
- create basic structure for sipcap app (no code yet)

netmap-libpcap/pcap-linktype.manmisc.in

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+.TH PCAP-LINKTYPE @MAN_MISC_INFO@ "23 October 2008"
+.SH NAME
+pcap-linktype \- link-layer header types supported by libpcap
+.SH DESCRIPTION
+For a live capture or ``savefile'', libpcap supplies, as the return
+value of the
+.BR pcap_datalink (3PCAP)
+routine, a value that indicates the type of link-layer header at the
+beginning of the packets it provides.  This is not necessarily the type
+of link-layer header that the packets being captured have on the network
+from which they're being captured; for example, packets from an IEEE
+802.11 network might be provided by libpcap with Ethernet headers that
+the network adapter or the network adapter driver generates from the
+802.11 headers.  The names for those values begin with
+.BR DLT_ ,
+so they are sometimes called "DLT_ values".
+.PP
+The values stored in the link-layer header type field in the savefile
+header are, in most but not all cases, the same as the values returned
+by
+.BR pcap_datalink() .
+The names for those values begin with
+.BR LINKTYPE_ .
+.PP
+The link-layer header types supported by libpcap are described at
+http://www.tcpdump.org/linktypes.html.
+.SH SEE ALSO
+pcap_datalink(3PCAP)