Adding initial getrusage interface.
Removing spurious close paren from pretty formatter.
Adding safe-setenv alternative to setenv to workaround shellshock bug.
Using safe-setenv for env parameters set in cgi requests.
Including sys/resource.h for struct rusage.
Adding non-blocking versions of send and receive.
Adding missing file from last patch.
Binding a socket makes it non-blocking by default.
Allowing primitives (currently only send/receive) to block just once
with SEXP_G_IO_BLOCK_ONCE_ERROR.
Adding ICMP protocol constant.