human readability of automagically generated namelists

[GoogleCodeExporter]

In the first instance we could afford to be lazy in the style in which we
wrote the namelists to file. In the current implementation of pydown.utils
the namelists are generated cycling through the keys of a a dictionary
without any sorting. This does not affect their functionality since Fortran
does not care about the order of the entries, at any rate, users will most
likely be accustomed to the order of the namelist entries that is used in
the default namelists that ship with WRF. 

Producing our namelists in the same fashion should then help with their
readability.

Original issue reported on code.google.com by [email protected] on 21 Mar 2008 at 10:20