rename everything 'deepamehta' to 'dmx'
We are in the middle of a transition, so some artefacts have already been renamed from
dmx, others were not. This is a bit confusing, so let's finish it.
I found these remaining issues:
- logging.properties: java.util.logging.FileHandler.pattern=deepamehta.log
- COPYRIGHT:txt: DeepaMehta is a platform for collaboration and knowledge management. http://www.deepamehta.de/