examples/trickle-library: correct probability expression

Documented intent is to update with probability 1/NEW_TOKEN_PROB where
NEW_TOKEN_PROB is 0x80.  The current implementation updates with probability
1/2.  Update NEW_TOKEN_PROB and the expression to keep existing behavior
while correcting the calculation.

Signed-off-by: Peter A. Bigot <pab@pabigot.com>
Removed some more old RCS tags from the Contiki source tree.
Merge pull request #273 from oliverschmidt/master

Removed some more old RCS tags from the Contiki source tree.
Made use of Atari XL shadow RAM.

The new Atari XL target allows cc65 programs to make use of
the shadow RAM. This allows to turn aon all features of the
web browser - and will allow for additional improvements to
come :-)
Merge pull request #274 from oliverschmidt/master

Made use of Atari XL shadow RAM.
Merge pull request #270 from pabigot/push/trickle-example

examples/trickle-library: correct probability expression
Merge branch 'upstream/master' into rebase