Added the possibility to set line thickness

SwingUtilities/src/main/java/fr/soleil/lib/project/swing/border/SettableColorLineBorder.java

@@ -11,7 +11,7 @@ import javax.swing.border.LineBorder;
  */
 public class SettableColorLineBorder extends LineBorder {
 
-    private static final long serialVersionUID = -1893539307265995931L;
+    private static final long serialVersionUID = -954792311453371930L;
 
     public SettableColorLineBorder(Color color, int thickness, boolean roundedCorners) {
         super(color == null ? Color.BLACK : color, thickness, roundedCorners);
@@ -34,4 +34,13 @@ public class SettableColorLineBorder extends LineBorder {
         this.lineColor = color == null ? Color.BLACK : color;
     }
 
+    /**
+     * Sets this {@link SettableColorLineBorder}'s line thickness.
+     * 
+     * @param thickness The line thickness to set.
+     */
+    public void setThickness(int thickness) {
+        this.thickness = thickness < 0 ? 0 : thickness;
+    }
+
 }