plieser-EtE_encryption/client: store encryption options as volattr
plieser-EtE_encryption/client: log errors
plieser-EtE_encryption/client: convert SYSTEM_V_FCNTL_H_O_WRONLY to SYSTEM_V_FCNTL_H_O_RDWR for write of encrypted files
plieser-EtE_encryption/client: block size and hash are now stored in the FileLockbox.
plieser-EtE_encryption/client: fixed async write