[DB] Adding IXP and Infrastructure Entities
[NF] Adding CRUD for Infrastructures and hiden CRUD for IXPs
[DB] Adding relation between switcher and interface
[IM] Allowing to enable multi IXP mode
[IM] Updating switcher add and editing forms
[IM] Add SQL queries for upgrade
Merge branch 'master' into im-infrstructure
[IM] Update DQL to use new infrastructure table
[IM] Various improvements for multi IXP framework
New idea / todo
Merge branch 'master' of https://github.com/inex/IXP-Manager
[DB] Private properties cause a lot of errors when serializing objects

http://blog.geertvd.be/2011/09/25/symfony2-id-returned-as-member-variable-from-__sleep-but-does-not-exist/
Merge branch 'im-d2-sleep'
Merge branch 'master' into im-infrstructure

Conflicts:
	CHANGELOG.md
	application/Entities/Switcher.php
	library/IXP/Form/Switch.php
	library/IXP/Form/Switch/AddBySNMP.php
[DB] private -> protected
Changelog update
[IM] Do not neet these restrictions on infra shortname
[IM] Restructure menu order to make it more sensible
[IM] Only show IXP in multi-IXP mode
[BF|IM] Better error and correct type. (NB-T2BOD)