Some variables were unintentionally global in nb.c.
Some variables were unintentionally global in nb.c.

JoaoRodrigues/freesasa,mittinatten/freesasa,JoaoRodrigues/freesasa,mittinatten/freesasa,JoaoRodrigues/freesasa,mittinatten/freesasa,JoaoRodrigues/freesasa,mittinatten/freesasa