Port "Stopping conditon of dual CD method for L1- and L2-loss SVM is changed"

Ported from cjlin1/liblinear@475dfdb

Author: bwaldvogel

src/main/java/de/bwaldvogel/liblinear/Linear.java

@@ -746,7 +746,8 @@ private static int solve_l2r_l1l2_svc(Problem prob, Parameter param, double[] w,
             if (iter % 10 == 0)
                 info(".");
 
-            if (PGmax_new - PGmin_new <= eps) {
+            if (PGmax_new - PGmin_new <= eps &&
+                Math.abs(PGmax_new) <= eps && Math.abs(PGmin_new) <= eps) {
                 if (active_size == l)
                     break;
                 else {