Network support (this is the important one!)
       I guess this might be useful for remote admin types. (I've had a
	request for this, so I will try to find time to work on it.)
	It won't make it for 1.0.0, which will be out Real Soon Now, but
	I'll try to work on it soon.

Tidy up chip selection code.
	Currently, only the first one or two lm75s, and the first lm78 or
	Winbond or gl518, are read. The others are ignored. Eventually,
	there will be chip-selection options at the command line. This is
	probably some way off as it is easy to write, but hard to see how
	to write in the best way. Most of the obvious ways are even more
	of a kluge for most people than the existing method.
