* Referring to groups generically as contacts is confusing.
* Friends are referred to as contacts in many places either as more
neutral wording, or to avoid using the keyword friend as a variable
name. Calling Contact Chat allows contact to be used for Friends.
We need to be lenient when reading from db because of ToxIds being saved in the
db from a bug introduced in e07d8d358f, which
used self ID rather than self Pk. Was subsequently fixed in
033f28e67e.