* fixed stats monitoring, and optimized some tv_* for most common cases.
* replaced temporary 'newhdr' with 'trash' to reduce stack size
* made HTTP errors more HTML-fiendly.
* renamed strlcpy() to strlcpy2() because of a slightly difference between
their behaviour (return value), to avoid confusion.
* restricted HTTP messages to HTTP proxies only
* added a 502 message when the connection has been refused by the server,
to prevent clients from believing this is a zero-byte HTTP 0.9 reply.
* changed 'Cache-control:' from 'no-cache="set-cookie"' to 'private' when
inserting a cookie, because some caches (apache) don't understand it.
* fixed processing of server headers when client is in SHUTR state
* automatically close fd's 0,1 and 2 when going daemon ; setpgrp() after
setpgid()
* updated the Makefile and the Formilux build script
* fixed multi-cookie handling in client request to allow clean deletion
in insert+indirect mode. Now, only the server cookie is deleted and not
all the header. Should now be compliant to RFC2109.
* added a "nocache" option to "cookie" to specify that we explicitly want
to add a "cache-control" header when we add a cookie.
It is also possible to add an "Expires: <old-date>" to keep compatibility
with old/broken caches.
* some doc and examples cleanups
