* estado_agente.php: Correct agent down status bug. Added search
on description also, and search text parameter is moved on pagination links
* estado_generalagente.php: Agent access graph has more height now.
* event_statistics.php: removed unnecesary header. Better layout.
* include/functions.php: human_time_description_raw() return "now" when
data is 0 or empty.
* db/db_main.php: Bigger graph.
git-svn-id: https://svn.code.sf.net/p/pandora/code/trunk@1565 c3f86ba8-e40f-0410-aaad-9ba5e7f4b01f
0e884091d8