remove

fun remove(group: Int)
fun remove(group: String)
fun remove(group: Int, file: Int, key: SymmetricKey = SymmetricKey.ZERO)
fun remove(group: String, file: String, key: SymmetricKey = SymmetricKey.ZERO)
fun remove(group: String, file: Int, key: SymmetricKey = SymmetricKey.ZERO)