Cities with no settlers/engineers

It would be nice to have a command to find cities that have
no engineers, so one could tell them by and by to build some.

More generally, it might be nice to be able to enter a list of
improvements and units that every city "ought" to have.  Then if a
city is building coinage and is missing any of the improvements and
units in that list, the Messages window would include a message about
the city, "City FOO is building coinage and missing X, Y and Z".
These messages could be grouped all together, just before the "may
grow" messages.