added json field name to javadoc of serialized fields in class Contact
added json field name to javadoc of serialized fields in class SyncedSettings
added json field name to javadoc of serialized fields in class Account
added json field name to javadoc of serialized fields in class DropServer
added json field name to javadoc of serialized fields in class Identity
added json field name to javadoc of serialized fields in class LocalSettings
added json field name to javadoc of serialized fields in class StorageServer
added json field name to javadoc of serialized fields in class StorageVolume