improve performance of mailwatch_milter_relay.php

[dneuhaeuser]

the code part which executes the SQL commands does not need to run after each line from the logfile is processed. instead it is sufficient to run SQL statements once after logfile is analyzed and relevant data was read into $idqueue array. so I moved this part into a separate function. this is a quite simple but very performance-effective change.

[shawniverson]

Very nice! I'll give this a test drive as well

[shawniverson]

This is good.

[dneuhaeuser]

can we merge this one or do you want any further changes?

[endelwar]

Thanks again!