[fix] fixed jpa relationships on User side
[refactor] made join column names a constant
[fix] removed relationships to user
[fix] removed now unnecessary "foreign key setting"
[fix] removed useless tests for setters and getters
[task] finished Email updater
[fix] removed unnecessary relationship between user and extension
[fix] removing last residues of relationships between user and
multi-valued attributes
[fix] removed useless tests for setters and getters
[fix] made foreign keys non-nullable
[task] added missing MutliValue Updater
[fix] fixed ddl and insert scripts
[fix] fixed insert sql script to reflect latest database schema
[cleanup] typo
[fix] fixed drop scripts to reflect latest database schema
[fix] added fields to insert statements
Merge branch 'fixing_jpa_relationships' into BT-21

Conflicts:
	resource-server/src/main/java/org/osiam/storage/entities/UserEntity.java