replace existing files with saveBytes(), also look into deployJava.js (issue #650)

core/src/processing/core/PApplet.java

@@ -5007,6 +5007,12 @@ public class PApplet extends Applet
       bos.close();
       bos = null;
 
+      if (targetFile.exists()) {
+        if (!targetFile.delete()) {
+          System.err.println("Could not replace " + 
+                             targetFile.getAbsolutePath() + "."); 
+        }
+      }
       if (!tempFile.renameTo(targetFile)) {
         System.err.println("Could not rename temporary file " +
                            tempFile.getAbsolutePath());
@@ -5058,6 +5064,12 @@ public class PApplet extends Applet
       output.close();
       output = null;
 
+      if (file.exists()) {
+        if (!file.delete()) {
+          System.err.println("Could not replace " + file.getAbsolutePath());
+        }
+      }
+      
       if (!tempFile.renameTo(file)) {
         System.err.println("Could not rename temporary file " +
                            tempFile.getAbsolutePath());

core/todo.txt

@@ -72,6 +72,8 @@ X   decision: add note to reference that the 'c' is a misnomer
 X screen.width/screen.height -> screen.width, screenW/H
 o   needs to be documented, and excise all screen.width/height references
 X   add to the 'changes' document
+X saveBytes() error when writing to existing file
+X   http://code.google.com/p/processing/issues/detail?id=667
 
 cleanup
 o if too many errors come through during setup, app will terminate