Files in [DirectoryMetadata](https://github.com/Qabel/qabel-core/blob/master/box/src/main/java/de/qabel/box/storage/jdbc/migration/DMMigration1468245565Hash.kt) and [FileMetadata](https://github.com/Qabel/qabel-core/blob/master/box/src/main/java/de/qabel/box/storage/jdbc/migration/FMMigration1468248484Hash.kt) now contain a hash and the hashAlgorithm used. Because of https://github.com/Qabel/qabel-core/issues/493 This needs to be contained in http://qabel.github.io/docs/Qabel-Protocol-Box/