+ basic flat list implementation
Refs: #18685
+ language and data element identifier based concept attribute populating added
+ a new utility class is created for common output helper methods
+ code refactoring & check style & formatting updates
Refs: #18685
+ Json - ld initial commit (without searching)
+ Code refactorings
Refs: #18685
+ label, lang, id, format parameters are added for json output
Refs: #18685
+ initial unit test for json output
Refs: #18685
+ Issue solved when language filtering used. Missing concepts are merged to results.
+ Test steps are added
+ Code formatting & Checkstyle updates
Refs: #18685
+ Language parameter removed from interface
Refs: #18685
+ Test steps added for identifier and label search
Refs: #18685
+ New test steps added for label and language based search
Refs: #18685
+ Broader narrower concept test step added
Refs: #18685
+ CORS support added for json api
Refs: #18685
Change JSON icon to JSON-LD. Refs #18685.
Remove Content-Disposition from HTTP response. Refs #18685.
Merge branch 'angularjs_18685'

Conflicts:
	pom.xml
	src/main/java/eionet/meta/dao/IDataElementDAO.java
	src/main/java/eionet/meta/dao/IVocabularyConceptDAO.java
	src/main/java/eionet/meta/dao/mysql/DataElementDAOImpl.java
	src/main/java/eionet/meta/exports/csv/VocabularyCSVOutputHelper.java
	src/main/java/eionet/meta/imp/VocabularyCSVImportHandler.java
	src/main/java/eionet/meta/imp/VocabularyImportBaseHandler.java
	src/main/java/eionet/meta/imp/VocabularyRDFImportHandler.java
	src/main/java/eionet/meta/service/data/VocabularyConceptFilter.java
	src/main/java/eionet/web/action/VocabularyFolderActionBean.java
	src/test/java/eionet/meta/service/CSVVocabularyImportServiceTest.java
	src/test/resources/seed-vocabularycsv.xml
+ Merging AngularJS branch into master.
+ Build errors are solved.
+ Unit tests fail.
Refs: #18685
+ Merging angularJs branch
+ Unit tests are passing
+ Code refactoring applied correctly from branch
+ Sql parameter usage update (which caused unit tests to fail when array is given with one element)
Refs: #18685
+ Code Cleanup after merging angularJS branch
Refs: #18685
Merge branch 'master' of https://github.com/eea/eionet.datadict