WebDBInjector and DMOZ separation

[David Spencer]

At a glance it seems that org.apache.nutch.db.WebDBInjector should (or 
could) have the DMOZ code taken out of it and put somewhere else, as the 
DMOZ code is really just a use of WebDBInjector and not essential to it 
and in theory there could be lots of different injectors (e.g. URLs from 
a DB...links from del.icio.us/furl.net ... RSS feeds recently updated 
blogs).

Benefit of doing this is minor of course and might be just a matter of 
taste, but if people want I'll enter a change request and attach a diff 
of the code changes [BTW: what are the right args to diff when 
submitting a code change?].