Added export module in classic core package
Fixed small bug with debug template
Fixed bug with recommender function "get_recommendations" 

It needs to return a consistent kind of output: always a dictionary even
when there are exceptions.
Working on the export module
Fixed small bug with recommendation title containing html
Re-anabled Topn and bug fixes

Plus work on export not ready yet
Export implemented

- Export of selected record or first N records from the query (with N
configurable in config)
- Export to ADS Classic works in the same way and not only with selected
records
Merge branch 'master'