[OGDev] Finding nodes missing metadata

[Nick Burch]

Hi All

Another new feature you might find useful:
    http://cotswolds.openguides.org/wiki/wiki.cgi?action=show_missing_metadata

It's now possible (well, with a SVN version of wiki::toolkit and 
openguides anyway) to filter nodes by a lack of metadata. For example, 
find all the nodes where no-one has entered the latitude or longitude.

Hopefully you'll all find this useful, just as soon as Dom has a chance to 
do a new release :)

Nick