UserInputPanel: inputs should not be validated when panel is reloaded due to checkbox/radiobutton having revalidate="yes" in their spec

Reload of panel calls all validator added to panel. Validator are executed even on reload, which should not be the case. Validator should only be executed when "next" button is clicked.

Following changes in izpack-src-trunk/src/lib/com/izforge/izpack/panels/UserInputPanel.java helps avoid validation in case of panel reload.
Variable "validating" already exists in code, however its usage has been commented out . I used it in few more places

Index: UserInputPanel.java
===================================================================
— UserInputPanel.java (revision 2817)
+++ UserInputPanel.java (working copy)
@@ -1196,7 +1196,7 @@
try
{
FileInputField panel = (FileInputField) field.getComponent();

• result = panel.validateField();
  + result = !validating || panel.validateField();
  if (result)
  {
  idata.setVariable(field.getAssociatedVariable(), panel.getSelectedFile()
  @@ -1221,7 +1221,7 @@
  try
  {
  FileInputField input = (FileInputField) field.getComponent();
• result = input.validateField();
  + result = !validating || input.validateField();
  if (result)
  {
  idata.setVariable(field.getAssociatedVariable(), input.getSelectedFile()
  @@ -1246,7 +1246,7 @@
  try
  {
  MultipleFileInputField input = (MultipleFileInputField) field.getComponent();
• result = input.validateField();
  + result = !validating || input.validateField();
  if (result)
  {
  List<String> files = input.getSelectedFiles();
  @@ -1834,7 +1834,7 @@

// validate the input
Debug.trace("Validating text field");

• boolean success = textField.validateContents();
  + boolean success = !validating || textField.validateContents();
  if (!success)
  {
  Debug.trace("Validation did not pass, message: " + message);
  @@ -3909,7 +3909,11 @@
  // readInput();
  // panelActivate();
  // validating = true;
  + Debug.trace("Setting validating to false");
  + validating=false;
  updateDialog();
  + Debug.trace("Setting validating back to true");
  + validating=true;
  }