Update database structure to prevent duplicate variables 

- Fix measurements 
Add tools for automatic conversion and rebuild
Update documentation
Merge branch 'develop' of https://github.com/gertvv/addis into develop

* 'develop' of https://github.com/gertvv/addis:
Change to JSMAA 1.0 and GeMTC 0.14.3
Update README for 1.16.3 release
Prepare for 1.16.3 release
Depend on JSMAA 1.0-ADDIS-1.16.3

- Add missing foreign keys to ADDIS 2.0 database
- Rename study_measurement_moments to measurement_moments
- Update documentation
Minor fixed to ADDIS DB 2.0

- Add missing foreign keys
- Add missing notes in transform
- Update documentation
Merge pull request #81 from joelkuiper/develop

Released ADDIS 1.16.3