Timer library

[Fabien Tassin]

According to Russ Allbery:
> 
> > it is possible to use nested timers ?
> > It is the reason I've created the history timer... it is sometimes
> > interesting to have reports of nested functions as a tree like the one
> > I've shown as a sample of "stathist".
> 
> The current innd timer code will do nested timers, or at least I didn't
> see any reason why it couldn't the last time I looked it over.  It was
> just that innreport didn't understand how to summarize the output in a way
> that made sense.

Sure it is working but there's no way to identify nested timers and then,
it is very difficult to make a timer more granular without removing the
existing one. innreport only suffer from this. I haven't found a magic
way to do it other than logging everything and post-processing the results :(

-- 
Fabien Tassin -+- fta at sofaraway.org