[UCR] Draft update for use case 8: Vocabulary Mapping for Data Integration

I think this is my final outstanding action ...

I've taken a stab at redrafting a version of the 8th UCR use case. This 
is somewhat abstracted from some real work on management systems 
integration with some poetic license thrown in.

http://www.w3.org/2005/rules/wg/wiki/UCR/Vocabularly_Mapping_for_Data_Integration

I've left the original version in place as well so it's easy to see what 
the new draft would replace (and make it easy to revert back if this 
isn't good enough for the next wd).

I've also left the typo in the name intact to avoid breaking links :-)

Dave