cli: Separate current and deprecated format version
Previously, the CLI would print a deprecation warning if a client
requested any format version other than the current one. However, if
we add fields that are backwards-compatible, but want clients to be
able to depend on, we need to bump the version, but that doesn't make
the older version deprecated.
Hence, separate out the "minimum active" version and only print a
warning for requests below this version number.
projects / notmuch / commit