D-Net

[maven-release-plugin] copy for tag dnet-msro-service-2.1.1

[maven-release-plugin] prepare release dnet-msro-service-2.1.1

Added missing space in email subject

added option for promoting shadow cache only

Refactoring for vocabulary persistence:
default DAO persists vocabularies on RegistryService.
An alias has been defined.
If we want to override the default bean the following property is to be used:
dnet.modular.ui.vocabulary.dao

First step of refactoring:
multiple persistence backends.
To-be-introduced: postgresVocabularyDAO

added FSYNC_SAFE write concern

First step of refactoring:
multiple persistence backends.
To-be-introduced: postgresVocabularyDAO