fixed bug: quality score threshold for nucleotide was not initialized when provided by the user

src/ROCKparams.h

@@ -70,6 +70,7 @@ public:
         parms.kappa=50;
         parms.kappa_prime=0;
         parms.lambda=0;
+        parms.nucl_score_threshold=0;
         verbose_mode=0;
         cms_size=0;
         expected_collision_proba=0.0;