Method removeIndex

* Removes an item at a specific index in the @c daeArray. * @param index Index number of the item to delete. * @return Returns DAE_OK if success, a negative value defined in daeError.h otherwise. * @note The @c daeElement objects sometimes list * objects in two places, the class member and the @c _contents array, when you remove something from the * dom, you must remove it fro