[IM] cosmetic fixes for sflow-to-rrd-handler
[IM] added peering manager sflow bgp session detector
Merge branch 'master' of https://github.com/inex/IXP-Manager
[BF] use different local variable names and protect with 'my'
[IM] wider use of variable names for code which is fundamentally the same
[IM] add script to check for required perl dependencies
[BF] bugfixes for Daemon::Control
[IM] Reduce cache time pf peering data from 1 day to 1 hour
[HK] Remove exranuous files
Merge remote-tracking branch 'origin/inex-live'
[DB] Schema update to VLANs table

Allows an admin to decide if a given VLAN should be included in the peering matrix or peering manager.

SQL update required:

```mysql
ALTER TABLE vlan ADD peering_matrix TINYINT(1) NOT NULL DEFAULT 0, ADD peering_manager TINYINT(1) NOT NULL DEFAULT 0;
```
[NF] Front end glue for new VLAN peering matrix / manager columns
[IM] Remove hardcoded INEX VLAN details - fixes #178
[IM] Remove hardcoded INEX VLAN details for peering matrices

Allows admins to set which VLANs should form part of the peering matrics.

Includes IPv6 selection bug fix.
Merge branch 'nf-vlan-pm-switches'
Version bump