[saga-rg] open() and open_dir()

[Graeme Pound]

Hi,

Another point regarding the open() and openDir() methods. This 
complicates this bit of the specification more than necessary.

Graeme

  -3.36 Why are the methods open() and openDir() replicated between 
directory, logical_directory and ns_directory which they inherit? 
Removing these methods from ns_directory would resolve the issue 
regarding the multiple open_flag and open_dir_flags enumerations, 
otherwise these methods could be removed from logical_directory and 
ns_directory.