added nsid to 'reading DB...' log message
when sleeping for a long time, print status msgs

every 100 seconds. Useful for servers where the export time is very long.
tinydns export errors are now non-fatal

rsync and compile errors were previously fatal, so the export process would immediately die and try again. This may not be desirable, especially if a lot of work is involved in exporting the data.
turn on output autoflush for nt_export

this goes with commit f32010687ac