* Refactored symbiosis-ssl code into the library
* Added tests to test this new code.
* symbiosis-ssl tries to regain privs after creating the certs if it
  thinks it has them.
* Changed what gets logged when a bit.  Stuff in the SSL validation
  checks is now only shown if $DEBUG is set.
* The cache of available SSL sets is always emptied before rollover
  starts.
* The way available sets are sorted has changed to be done by expiry.
* The symlink to current now uses the full path.
* SSL sets are now kept in config/ssl/sets for neatness/namespace
  goodness.
* CertificateSet#write drops privs if possible when creating a new set.