New OPM Health Status Report

I'm not finished with this, but the structure is all there, and it's just a matter of continuing to add indicators.  I figure we should get this reviewed and merged, then subsequent changes can be quick and easy to get in.  This doesn't affect any existing reports, it's an additional report which the partner knows is in the alpha stages.
@czue
yeah, it doesn't make a difference to the `if` statement below (`if num_children > 1`), which is the only place it had previously been used, and it makes more sense for counting children.