[Tinyos Core WG] note on safe testing

[John Regehr]

Quick note to anyone testing safe apps.  There are three cases:

1. safe app behaves same as unsafe-- this is good

2. safe app signals a runtime error (lots of LEDs blinking, see "man 
tos-decode-flid" if you've installed tools from CVS head recently)-- 
this is actually fine too since these are generally easy to debug.  The 
problem could lie either in the application or in the Deputization of it.

3. safe app does not signal a runtime error, yet still behaves 
differently from the unsafe app-- this is bad and supposed to never 
happen and is very hard to debug.  Please bring this to my attention.

John