Now is possible to show a graph of the interface traffic from the agent view

* pandora_console/operation/agentes/interface_traffic_graph_win.php:
	Added file. Shows a combined graph of the interface traffic.

* pandora_console/operation/agentes/estado_generalagente.php: Now a graph
	icons will appear on the interface information if the modules
	ifInOctects and ifOutOctets exists for this interface.

* pandora_console/include/functions_custom_graphs.php: Modified the
	function "custom_graphs_print" to add a new parameter to set
	the base url of the graph images.
Merge branch 'feature/ticket#1319-CombinedGraph' into develop