[WIP] Adjust Newscoop schema for tageswoche migration (only needed chnages)

* provide new rewited upgrade script, 
* add new upgrade sql, 
* adjust entites to new schema
* remove unused sql upgrade files (we support upgrade only for 2 versions back what mean that in 4.3 can be upgraded from newscoop >= 4.1)
* move example out of newscoop dir