* pandoradb.sql: Updated schema for tplanned_downtime
* include/functions_db.php: Small bug that gave a warning in case there were no events for an agent
* godmode/agentes/planned_downtime.php: You can now create planned downtime schedules. This
won't work yet as the server doesn't support it yet. So I didn't integrate it in the menu either, but it can be.
* general/links_menu.php: The first link will also show up. It wasn't showing up because the mysql function
that was used moved the internal pointer ahead while checking if it existed. Used new functions.
git-svn-id: https://svn.code.sf.net/p/pandora/code/trunk@987 c3f86ba8-e40f-0410-aaad-9ba5e7f4b01f
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