Draft: API: remove UniqueResult, lower-case at, size for ResultSet

Summary

• Remove UniqueResult
• At and Size are lower-case now (ResultSet, MultiResultSet)

include/caosdb/configuration.h

@@ -113,6 +113,7 @@ public:
   friend class ConfigurationManager;
 
 private:
+  auto ConvertLogLevel(const std::string &string_level) const -> int;
   auto CreateConsoleSinkConfiguration(const object &from,
                                       const std::string &name, int level) const
     -> std::shared_ptr<caosdb::logging::SinkConfiguration>;
@@ -236,7 +237,9 @@ private:
   ConnectionConfigurationHelper connection_configuration_helper;
   LoggingConfigurationHelper logging_configuration_helper;
 
-  inline ConfigurationManager() { InitializeDefaults(); };
+  inline ConfigurationManager(){
+    // InitializeDefaults();
+  };
 
   /**
    * Initialize this ConfigurationManager with the defaults.