Remove support for storing raw .arpa names

[Kris Deugau]

Many reverse zone operations rely on IP address voodoo, which we really want to use the native Postgres operators for.

Storing raw .arpa names was supported initially to simplify import/display operations, but they don't work with CIDR operators. Supporting both has just added complexity anyway, instead of just applying them on export or display as needed.

Check everything that may touch these names and make sure they get converted to standard CIDR or bare-IP notations.