Ranges now include % used in the interface
Can now update networks without getting allocation error
Network allocation clean now checks for prefixlen match in filter as well as ipv6 uppers
Fixed allocation errors not showing up when updating a network lower/prefixlen values
Merge pull request #278 from church29/RangeUsage

 Show range usage on Interface creation form
Merge pull request #279 from church29/Network_Update

Can now update networks without getting allocation error. Fully functional, all tests pass.