- Finalized the zone name XML implementation

Update schema with assessmentdata table. Contains samplinpoint(s) and/or model to be used for assessmentregime

- zones,
- eea_zonetype,
- eea_objecttypes,
- eea_reportingmetrics,
- eea_protectiontarget,
- eea_assessmentthresholdexceedances,
- assessmentregimes

Added default import script for:
- eea_zonetype,
- eea_objecttypes, 
- eea_reportingmetrics,  
- ee_protectiontarget,
- eea_assessmentthresholdexceedances