Allow overriding the user and the config file paths for ntpd.
This also adds back --privsep-path from OpenNTPD, which really only
changes the installation instructions from 'make install', since ntpd
always uses the home directory of the ntpd user.
This borrows from the Darren's portable OpenNTPD and from OpenSSL, add
credits and a license.

As long as autoconf requires an AUTHORS file, might as well use it.
Refer to the public commit logs for all contributors - that's what
they're for.

This makes it easier to see what is supported by each OS, and to improve
them individually.

I removed all of the code in fake-sensors, I don't think Henning wants
all the credit for an empty file.

TODO: convert u_int_* types to uint_*

ensure we get HAVE_ defines set by autoconf

Well, support may be too concrete of a term. There is a lot that is
missing in OS X, and not everything can be implemented with portability
shims. The time APIs in OS X seem to have frozen with NeXTSTEP and never
advanced with POSIX.

This reworks a few of the common patches on Debian and Gentoo to be a
little nicer, and changes the patches to be per-fix rather than
per-file.

include naddy's patch for using the LOG_NTP syslog facility

EAI_NODATA has been made obsolete.
Properly detect MD5Init in -lmd

Remove dependency on libcrypto, include hash headers in a nicer way.

First attempt at building a new OpenNTPD portable project, based on the
latest OpenBSD source.