This is nMOLDYN version 3.0.3:

A major bug related to Tix fixed.

When checking whether Tix is installed on a machine using the
Tix-recommended way:

    try:
        import Tix
        root = Tix.Tk()
        root.tk.eval('package require Tix')
    except:
        root = Tk.Tk()

an exception was actually caught on machines where Tix was not installed
but a pending Tix.Tk() object remained triggering the existence of two
Tk instances messing up the nMOLDYN GUI. As no satisfying solution could
be found, the very few Tix-based wigdets used in nMOLDYN GUI were replaced
by Tk equivalents.

Others changes:

    - some directories and files were renamed or moved.
    - there is no global variables anymore
    - the exension files used by some analysis are now provided directly
      in C. So, Pyrex does not necessarily need to be installed.