• Teach pmcstat(8) to log over the network; the -O option now takes a host:port specification.
• Update the manual page and add an example showing how log over the network using pmcstat(8) and nc(1). Document the current inability to process logs in cross-platform manner.
• Have pmcstat_open_log() call err(3) directly in case of an error; this simplifies error handling in its caller.

MFC after: 1 week