Factorize, reorganize, and move code around.

The boot-conf and boot code had various bugs, and some of it was big,
ugly, unwieldy, and, sometimes, plain incorrect. I'm just about
completely replaced these ugly parts with something much more manageable.

Minor changes were made to the well-factorized parts of it, to accomodate
the new code.

Of note:

	* make sure boot-conf has the exact same behavior wrt boot order
as start.

	* Correct both boot and boot-conf so they'll work correctly when
compiled in, as they both had some bugs, minor and major.

	* Remove all the crud from loader.4th back into support.4th, for
the first time since boot-conf was first improved. Hurray!

I'm fairly satisfied with the code at this time. Time to see about those
man pages...

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