[dev] Patch - AgentPrint

Hi, Here's a patch for AgentTicketPrint that make the ticket printing function executing much faster. It basically separates the query in 2 parts and avoid the costly joining that was happening before. We've been using it for the last 3 weeks with our OTRS installation, and it has improved the printing execution time around 10 times on average. The system is OTRS 1.2.3 with over 30,000 tickets connecting to a postgres v7.3 database. Could the main developers please review it, and possibly consider using it for next release. Regards, Xavier Bergade