convert pcap.htm to a symlink

The files pcap.htm and pcap.html had identical contents at import time.
Later on only pcap.html was updated, yet many pages on the Internet
still link to pcap.htm. Convert the stale file to a symlink to start
delivering updated contents to readers.
regenerate all libpcap and tcpdump man pages
suppress broken man2html links (GH #143)

for f in tcpdump_man.html pcap3_man.html manpages/*.html; do
 sed -i 's@<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A>@<A HREF=".">Return to Main Contents</A>@g' $f

 sed -i 's@<A HREF="/cgi-bin/man/man2html">man2html</A>@man2html@g' $f
 sed -i 's@<A HREF="/cgi-bin/man/man2html?3N+ethers">ethers</A>@ethers@g' $f
 sed -i 's@<A HREF="/cgi-bin/man/man2html?4P+tcp">tcp</A>@tcp@g' $f
 sed -i 's@<A HREF="/cgi-bin/man/man2html?4P+udp">udp</A>@udp@g' $f
 sed -i 's@<A HREF="/cgi-bin/man/man2html?4P+ip">ip</A>@ip@g' $f
 sed -i 's@<A HREF="/cgi-bin/man/man2html?4+pf">pf</A>@pf@g' $f
 sed -i 's@<A HREF="/cgi-bin/man/man2html?8+pfconfig">pfconfig</A>@pfconfig@g' $f
 sed -i 's@<A HREF="/cgi-bin/man/man2html?2+select">select</A>@select@g' $f
 sed -i 's@<A HREF="/cgi-bin/man/man2html?2+poll">poll</A>@poll@g' $f
 sed -i 's@<A HREF="/cgi-bin/man/man2html?1+autoconf">autoconf</A>@autoconf@g' $f
 sed -i 's@<A HREF="/cgi-bin/man/man2html?1M+usermod">usermod</A>@usermod@g' $f
 sed -i 's@<A HREF="/cgi-bin/man/man2html?1+tcpslice">tcpslice</A>@tcpslice@g' $f
 sed -i 's@<A HREF="/cgi-bin/man/man2html?3+strerror">strerror</A>@strerror@g' $f
 sed -i 's@<A HREF="/cgi-bin/man/man2html?1+kill">kill</A>@kill@g' $f
 sed -i 's@<A HREF="/cgi-bin/man/man2html?1+stty">stty</A>@stty@g' $f
 sed -i 's@<A HREF="/cgi-bin/man/man2html?1+ps">ps</A>@ps@g' $f
 sed -i 's@<A HREF="/cgi-bin/man/man2html?3+strftime">strftime</A>@strftime@g' $f
 sed -i 's@<A HREF="/cgi-bin/man/man2html?4+bpf">bpf</A>@bpf@g' $f
 sed -i 's@<A HREF="/cgi-bin/man/man2html?4P+nit">nit</A>@nit@g' $f

 sed -i 's@<A HREF="/cgi-bin/man/man2html?7+pcap-linktype"@<A HREF="pcap-linktype.7.html"@g' $f
 sed -i 's@<A HREF="/cgi-bin/man/man2html?7+pcap-tstamp"@<A HREF="pcap-tstamp.7.html"@g' $f
 sed -i 's@<A HREF="/cgi-bin/man/man2html?7+pcap-filter"@<A HREF="pcap-filter.7.html"@g' $f
 sed -i 's@<A HREF="/cgi-bin/man/man2html?5+pcap-savefile"@<A HREF="pcap-savefile.5.html"@g' $f

 sed -i 's@<A HREF="/cgi-bin/man/man2html?1+tcpdump"@<A HREF="../tcpdump_man.html"@g' $f
done
update .gitignore and remove .cvsignore