new: HTTP referrer field
chg: HTTP_IS_QUERY macro
chg: replace all http_info strings by a single shared string of 4k bytes
chg: limit stored URLs to 3500 bytes
chg: make HTTP_URL_MAX_SIZE public
chg: dev: better handling of NULL in parser_ref/mux_subparser_ref
new: ip_addr_eq helper
fix: segfault due to writing past http_info strs
chg: nicify http parser
chg: two new hooks for HTTP: at end of headers and in body

  With more info.
fix: reset HTTP parser after a msg without body
fix: dev: unit tests on http-chunked
fix: reporting wrong size to HTTP body subscribers
fix: add new field in http unit test
fix: crash at exit - as digest queues are refed, do not forcibly del them at exit
fix: avoid using wall clock time instead of packet time for timeouting, capturing, etc...
new: Server field in HTTP infos
new: poor man's Ajax detection
chg: applicative hooks pass pointer to app payload instead of mere packets
chg: file_open returns -errno on error