add doc/initscripts.txt with description of lighttpd signal handling
and links to the initscripts of various operating system distros
"init scripts outdated, should be removed"
See doc/config/lighttpd.conf for explanation of listen() backlog queue
Additionally, mod_fastcgi and mod_scgi backend servers can now also be
configured with separate listen-backlog settings per server
"add server.listen-backlog option instead of hard-coded value (128 * 8) for listen()"
"Don't disable backend when overloaded"