[BF] Using better function
[IM] Defaults to first IXP
[IM] Removing unnecessary variable
[IM] Allowig to filter statistics list by IXP
[BF] Fixing logic with aggregate graphs
[IM] application/views/customer/overview-tabs/ports/port.phtml more IXP information if multiIXP mode enabled
[IM] Default to first IXP
[IM] On siwtch configuration allows user to select IXP if multiIXP mode enabled