[#121] Fix bug in image importing script

The script for importing project images for the Cordaid IATI XML
projects generates the wrong file name, resulting in the images being
served as text/plain by Apache.

Fix by appending the original image extension to the generated file name.
[#121] Remove Cordaid business unit from data migration

Migration 0034 sets up a number of organisations with internal
organisation IDs for Cordaid, since they are internal business units of
Cordaid. One of those orgs has been removed from the live dataset
however so the migration fails.

Fix by removing the missing org.

Note: this only highlights how brittle this way of handling the BUs is.
What's really needed is some form of meta data in the XML we get from
Cordad listing and identifying their BUs.