New Feature:
- Able to update the xml file either using the drop down or the editor.
Bug fixed:
- Able to update the drop down values if they were updated using the editor.
- Enable the 'delete' button after a second sphinx configuration file is created.
- Ignore the xml value attribute as part of its hash code key in the PropertyElement class. When the value changes dynamically, this PropertyElement class will not be found in the list because its hash code is different.