Docs and NEWS for breakpoint changes

[Vladimir Prus]

Now that the code patches for my breakpoint changes are in,
here's the doc patch and NEWS addition.

The doc patch document that a breakpoint can have several
locations, and that individual locations can be enabled
and disabled.  It also rewords pending breakpoint docs
to better reflect current code -- where every breakpoint is
reevaluated when new shared libraries are loaded, and pending
breakpoint is merely a breakpoint that don't have a valid
address as yet, not a temporary kind of breakpoint that
tends to morph into ordinary breakpoint on any occasion.

Comments?

- Volodya
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