Fix bug of the FileConnection API implementation
Implement filtering in Connection::listImpl
Add other needed methods to Indicator and IndicatorManager
Merge pull request #89 from marco-c/fix_fileconnection_api_bug

Fix bug of the FileConnection API implementation
Merge pull request #90 from marco-c/implement_listImpl_filter

Implement filtering in Connection::listImpl
Merge pull request #91 from marco-c/add_indicator_methods

Add other needed methods to Indicator and IndicatorManager