Make /python/CFDataFile.py work on both Python 2.x and Python 3.x with no need to run 2to3 for the python 3.x users.

git-svn-id: svn://svn.code.sf.net/p/crossfire/code/maps/trunk@11459 282e977c-c81d-0410-88c4-b93c2d0d6712

python/CFDataFile.py

@@ -79,7 +79,7 @@ class CFDataFile:
         else:
             header = dic['#']
             del dic['#']
-            index = dic.keys()
+            index = list(dic.keys())
             index.sort()
             contents = '#|%s\n' %('|'.join(header))
             file.write(contents)
@@ -150,7 +150,7 @@ class CFData:
 
     def get_keys(self):
         '''returns a sorted list of the primary keys (usually names) in the datafile'''
-        keys = self.datadb.keys()
+        keys = list(self.datadb.keys())
         keys.remove('#')
         keys.sort()
         return keys