* Check keys on import?
+ * Non self-signed user IDs
+ * Non self-signed subkeys
+ * Invalid revocations
+ * Signatures marked as non-exportable
+ * PKS subkey damage
* Better signature subpacket parsing (primary UID for example).
* Better merging of signatures; need to compare subpackets on Type 4 packets
and choose which we should use (how? most recent date?)
* Test library?
* Full email interface support (ADD, INDEX etc)
* More comments.
-* Look at db2 backend - is it db2's fault? (Well, deadlock in that the library
- probably is...). Pull some of the DB3 stuff across for completeness.