ix_update: when the server sets properties, tell the client

[rjbs]

Worth noting is that this will not yet report cases when the server sets a propert the user tried to update, but sets a different value. We want a better Ix::Util::differ before we implement that.

This should meet all our need for now, though.

[wolfsage]

+1, though your commit message has a typo ('sets a propert the user')

[rjbs]

Thanks, amended and applied.