Integrate PD status into WUI

[rgrp]

For each main model object have a new attribute called pd:

• Configured (perhaps in ini or just by hardcoding in module for time being) to look up a particular extra key e.g. pd.pdw.fast
• Either:
  1. (preferred) Compute on page access (if not already computed -- and store)
  2. Or use one generated in bulk such as pd.pdw.fast

Then render this in template:

• Nice to render it as a colour and number (so put it as red if not pd and green if it is) -- start out with just number

Notes:

• for items if no work treat item as a work ...

[dread]

Initial changes for person and work here: 527b502c6778

[rgrp]

Done in cset:3601b7cb6957 (and touched up in cset:9458c39a68e0)

More work could be done e.g. to use a proper traffic light (search in clip-art libraries) but good enough for the time being.