Description of problem: The line 
### Comment all HorizSync and VertSync values to use DDC:
is repeatedly added to xorg.conf

Version-Release number of selected component (if applicable):
pyxf86config-0.3.24-1

How reproducible:
consistently

Steps to Reproduce:

1. run nvidia-config-display from the xorg-x11-drv-nvidia package of livna rpms
2. Check xorg.conf
3. Note that this appears to be a python bug, not a problem with the nvidia script
  
Actual results:
a new line "### Comment all HorizSync and VertSync values to use DDC:" has been
added to xorg.conf. Over time the xorg on my laptop grows enormous. 

Expected results:
xorg.conf should not be modified

Additional info:
The culprit seems to be ixf86configmodule.so.  This file includes the line that
is added.

The call to ixf86config that adds the relevant line may be:

#
# Adds a module to the Modules section.
# The module will only be listed once.
#
def addModule(modules, moduleName):
    m = ixf86config.XF86ConfLoad()
    m.name = moduleName
    removeModule(modules, moduleName)
    modules.load.insert(m)