Add a Debian squeeze specific packages file

This removes the | alternations in favour of the version
specifically available in Debian squeeze.  (The | breaks the
suggested install instruction using "xargs -a" in any case.)
The libapache2-mod-wsgi package has also been removed, since
this would cause Apache to be installed even if we're using
nginx.

conf/packages.debian-squeeze

@@ -0,0 +1,11 @@
+python-yaml
+python-simplejson
+python-django
+python-psycopg2
+libgdal1-1.6.0
+postgresql
+postgresql-8.4-postgis
+memcached
+python-memcache
+python-gdal
+python-django-south