add missing rcsid

change to <limits.h> universe. The only changes in the binary are due
to the heavy use of assert.
ok millert

When the three possible return values are -1, 0, and 1, != 1 is the same
as <= 0. And the latter is the normal idiom so use that.

ok claudio@ henning@

deal with msgbuf_write EAGAIN, ok gilles benno

Protect against fd exhaustion when reopening database files. Only accept
client or control connections when there are at least 8 fds available,
and close a connection before calling imsg_read if it

Protect against fd exhaustion when reopening database files. Only accept
client or control connections when there are at least 8 fds available,
and close a connection before calling imsg_read if it would be unable to
accept an fd from the parent process.

ok gilles@

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Move generic imsg/libevent glue to a separate file.

with eric@ at c2k10