Currently, a tar.gpg archive is decrypted and saved at the given location into a newly generated folder named with the base name of the archive. This is because the archive might contain a lot of individual files.
Especially if the archive contains only a folder, this may be annoying.

Therefore we want to add an option to directly extract to the given directory, without adding a new output folder.

This should apply to OpenPGP and S/MIME archive extraction, accordingly.