* Add GPG._generated_keys as an _utils.InheritableProperty class for storing
a configurable (even by subclasses of GPGBase, without property overrides)
subdirectory of whichever directory gnupg.GPG.homedir is set to. This
subdirectory can be used via the 'separate_keyring=True' option to
gnupg.GPG.gen_key_input(), which will switch temporarily to new pubring.gpg
and secring.gpg keyrings during key creation, and upon finishing creation
of the new key, will ask for the new key's fingerprint, and move the
keyrings into this GPG._generated_keys directory, renamed in the format
"<GPG.homedir>/<GPG._generated_keys>/<fingerprint>.[pub|sec]ring.gpg".
Isis Lovecruft