export on its way
Les binary sont maintenant des multinary
Revert "Les binary sont maintenant des multinary"

This reverts commit 6f542f7b89dbbcbcfc7d24f7592f39a47ddb4690.
plus multinary mais on peut utiliser add(operation)
Merge remote-tracking branch 'origin/nOperandOperation' into XML-export

Conflicts:
	Formular/src/org/formular/core/IOperation.java