Re-ordered items in a list
Added help for the directory window
Added a menu item to open directory settings file
Disable duplicate menu item if there is no selection
Work around stringByAppendingPathExtension adding a dot when there is no extension
Indirectly check for text window leaks
Added ftest to verify that directory windows don't leak
app_opendir checks to see if the argument is actually a directory
Don't open a new directory window is one is already open