added documentation
first draft version of the eight qeen problem
seems to work but need some testing
feature that remains to be done
-remove dirty testing messages
-add command line controle option
-count the numbers of solution
-display the solutions in a clearer way (and do not depend of an empirique assumption)
-optimise code
in second diag test prog was reading uninitialised value
displaying bdd
Merge branch 'master' of https://github.com/Quentinz/bdd