unwind: better debugging of exceptions.

Once upon a time when we didn't have continuable warning
exceptions, it was easy to debug internal error throws in TXR:
just set a breakpoint on uw_throw and catch it in the
debugger. This approach became unworkable with uw_throw being
executed numerous times as part of the ordinary program
control flow. With this change, we get that debugging
experience back.

* unwind.c (uw_break_on_error): New static variable.
(uw_throw): If the break-on-error variable is set and we
are processing an exception derived from error, then
call the breakpt function.

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