Rename Persitence provider for preview as it would cause name clash w…

…ith saved user prefs

PreviewAPI/src/org/gephi/preview/PreviewModelPersistenceProvider.java → PreviewAPI/src/org/gephi/preview/PreviewPersistenceProvider.java

@@ -32,7 +32,7 @@ License, or (at your option) any later version.
  * @author Mathieu Bastian
  */
 @ServiceProvider(service = WorkspacePersistenceProvider.class)
-public class PreviewModelPersistenceProvider implements WorkspacePersistenceProvider {
+public class PreviewPersistenceProvider implements WorkspacePersistenceProvider {
 
     @Override
     public void writeXML(XMLStreamWriter writer, Workspace workspace) {