make networks not nullable on ranges
PEP8 cleanup
don't migrate ranges without networks
south migrations for nonnullable range networks
cleanup dynamic interface migration
catch uncreated ranges in dhcp migration
fix improper tuple size
really stick to the idea that ranges have networks
reintroduce range-network validation
give ranges networks in dynamic interface api tests
add networks to range view tests
add domain-only flag to dns_migrate
don't migrate invalid ranges
a bit more useful error messages
allow single-address ranges in single-address networks
Merge pull request #493 from murrown/range_notnullable_network

Force ranges to have an associated network