[DB] New schema for updated network infomation table
[NF] Removing ignored library dirs for migration to git submodules

**NB:** This is a major version bump as we are changing the manner in
which third party libraries are included with IXP Manager.

Upgrade to this tag specifically first, then to the next tag (v3.1.1)
and follow the instructions there.

We use a large number of external / third party libraries and it's
very easy to get out of sync with these. By using Git submodules we
can make the install procedure easier as well as ensure the known
supported versions of third party libraries are used.

After upgrading to this version, remove the following directories from
your `library/` directory:
[HK] Add Zend library as external
[HK] Add Smarty library as external
[HK] Add OSS-Framework library as external
[HK] Add OSS-SNMP library as external
[HK] Add OSS clone of Bootstrap-Zend-Framework library as external
[HK] Add Minify library as external
[HK] Add Bootbox library as external
[HK] Add Throbber.js library as external
[HK] Add IXP Manager GitHub wiki as external
[HK] Added these two submodules in the parent directory in error
[HK] Add OSS clone of Bootstrap-Zend-Framework library as external
[HK] Add OSS clone of Minify library as external
[HK] These scripts are redundant now that we are using submodules
Version bump and change log
[HK] These should have been removed
[BF] Check that $user is defined before accessing it
[IM] Configurable offset for authentication page logos
[IM] Do not hang when loading dashboard without aggregate graphs