Changed the input field for the interpreter to use (in the preferences
window) to a combobox listing the known interpreters.
diff --git a/Mac/OSX/PythonLauncher/PreferencesWindowController.m b/Mac/OSX/PythonLauncher/PreferencesWindowController.m
index 79344f6..e7ddfdd 100644
--- a/Mac/OSX/PythonLauncher/PreferencesWindowController.m
+++ b/Mac/OSX/PythonLauncher/PreferencesWindowController.m
@@ -90,5 +90,21 @@
     [self update_display];
 };
 
+// NSComboBoxDataSource protocol
+- (unsigned int)comboBox:(NSComboBox *)aComboBox indexOfItemWithStringValue:(NSString *)aString
+{
+    return [[settings interpreters] indexOfObjectIdenticalTo: aString];
+}
+
+- (id)comboBox:(NSComboBox *)aComboBox objectValueForItemAtIndex:(int)index
+{
+    return [[settings interpreters] objectAtIndex: index];
+}
+
+- (int)numberOfItemsInComboBox:(NSComboBox *)aComboBox
+{
+    return [[settings interpreters] count];
+}
+
 
 @end