* src/encryptionresult.h, src/encryptionresult.cpp (class
EncryptionResult): New methods isDeVs and isBetaCompliance.
* src/encryptionresult.cpp (EncryptionResult::Private): New
field res.
(EncryptionResult::Private::Private): Change type of argument r from
pointer to const-reference. Copy-construct res from r. Clear
invalid_recipients field of res after copying invalid recipients.
(EncryptionResult::init): Adapt call of Private c'tor to changed
argument type.
(operator<<): Add new flags.