First fix for bug with OOGP when primitive and terminal insertion is not ordered.

See gist : https://gist.github.com/cmd-ntrf/7cf0db102eec88041432
and thread : https://groups.google.com/forum/#!topic/deap-users/4ASc8RZzpVc
Add gp OOGP fix description in release 1.0.2 highlights.
Add subsection title for bug fixes of release 1.0.0.