REST service:   - korap to public service interface that only includes publicly available functions  - reset passphrase request moved to UserService   Exceptions:  - added EmptyResultException
REST service: 
 - korap to public service interface that only includes publicly available functions
 - reset passphrase request moved to UserService
 
Exceptions:
 - added EmptyResultException

Policy Service:
 - distinguising retrieve and build policies
 - throw EmptyResultException if no policies available
 - QueryParser and QueryRewriter (latter not yet implemented) 
 - general bug fixing


KorAP/Koral