- Expose the script filename in the Python module environment 'mod_env'

instead of the config_file structure which includes the linked list
  of scripts in a multi Python module setup; fixes #79.

pythonmod/doc/modules/config.rst

@@ -339,4 +339,5 @@ config_file
 
    .. attribute:: python_script
    
-      Python script file.
+      Linked list of Python script files.
+      Deprecated; `mod_env['script']` should be used instead.

pythonmod/doc/modules/env.rst

@@ -6,8 +6,11 @@ Global variables
 
 .. envvar:: mod_env
 
-   Module environment, contains data pointer for module-specific data.
-   See :class:`pythonmod_env`.
+   Module environment, it is the 'data' pointer for module-specific data
+   in :class:`pythonmod_env`.
+   It is initialized as a dictionary with the 'script' key pointing to the
+   module's python script.
+   It can be further populated during runtime for module-specific data.
 
 
 Predefined constants