* Do pathlengths for similar email addresses to help aide keysigning.
(ie "Find me the keys furthest from mine that end ox.ac.uk'")
Suggested by Jochen Voss <voss@mathematik.uni-kl.de>.
-* Other stats. sixdegrees? with piccy? most signed? signs most?
+* Other stats. with piccy? most signed? signs most?
* DB access modules as a library to allow runtime configuration of it?
* Clean up gcc warnings (`ll' length modifier especially! Also inline & wrong
signedness for lo_read/write)
* autoconf
* logging framework so we can log debug/warning messages and so on. syslog?
* Full email interface support (ADD, INDEX etc)
-* Check freeing.
* 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.