Work item list: eliminate l_fp from refclocks

[Hal Murray]

Gary pointed out:
> Just about every refclock has their own way of doing the timestamp.

The problem is that things like refclock_process_offset() take l_fp as 
arguments.  We can add wrappers that use timespec, convert to l_fp, then call 
the old code or the reverse depending on the order we do things.

I think this is worth splitting out from eliminating l_fp except at the edge.


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