v0.0.46: Add support for TLS-SNI hooks; combined certificate file reform

The HAProxy hook is now rebranded as the combined certificate file hook.

lighttpd is now considered a daemon which needs combined files.

TLS-SNI code cleaned up, support for 'n' removed now that it has been
removed from the ACME specification. TLS-SNI challenges can now
be met using hooks.

Fixed a bug where quickstart didn't pass --hooks to crontab if --hooks
was specified on the command line.

Allow FDB permissions customization to specify UID without specifying GID and
vice versa.