gotwebd: drop unused `prefixlen' from struct address ok stsp@

gotwebd: provide gotweb_render_page() entrypoint for all pages simplify gotweb_process_request more, handling all the pages inside the big switch. There's only one entrypoint for rendering the templates gotweb_render_page() that takes the page' content as argument. The only real difference is that gotweb_render_index() now skips directory entries which fails to handle. ok tracey@

gotwebd: handle short reads and timeouts If a short read happens, or if all the fastcgi record to read don't fit in the buffer, gotwebd fails to continue reading and hits the timeout. If this happens before gotweb_process_request is called, it will crash in gotweb_free_transport since c->t will be NULL. This register the event with EV_PERSIST so fcgi_request is called again when there's more to read and guards gotweb_free_transport. It also makes spaces for the records as soon as they're successfully parsed. With lots of help from stsp ok stsp@

gotwebd: start using the template system ok tracey@

make gotwebd cache open repository handles in struct server ok op@

allow multiple "listen on" statements per server in gotwebd.conf ok tracey

mark functions internally used by sockets.c as static ok tracey

fix previous: store port number in host byte order, convert for struct sockaddr With the previous patch the listen port was correct, but the debug log output was still displaying the swapped port number. Now both listen behaviour and debug log output agree.

gotwebd: struct socket_conf can only use a single address, so don't use a list ok tracey

gotwebd: initialize IPv4 and IPv6 sockets in the same way ok tracey

gotwebd: do not allocate server/socket list heads separately ok millert@

gotwebd: do not allocate address list heads separately, this is unnecessary ok millert@

fix snprintf error handling follow the "proper secure idiom" described in the CAVEATS section of printf(3). reminded by tb@ and millert@

remove the last remaining use of sin_len from gotwebd I don't think this assignment to sin_len is needed at all, because sin_len is already being set via got_sockaddr_inet[6]_init() during the configuration stage. Tested successfully on both fcgi socket types (unix / tcp).

fix potential type mismatch between format specifier and argument Cast argument of type rlim_t to unsigned long long to match the %llu format specifier on platforms where this might not be the case.