Rename ndiff.py and difflib.py modules, which are only provided for

python 1.5 compatibility.

* lib/difflib.py
* lib/ndiff.py
* lib/compat_ndiff.py
* lib/compat_difflib.py
    rename 

* viewcvs-install
    update ndiff invocation


git-svn-id: http://viewvc.tigris.org/svn/viewvc/trunk@1241 8cb11bc2-c004-0410-86c3-e597b4017df7

lib/compat_ndiff.py

@@ -99,7 +99,7 @@ __version__ = 1, 6, 1
 # is sent to stdout.  Or you can call main(args), passing what would
 # have been in sys.argv[1:] had the cmd-line form been used.
 
-from difflib import SequenceMatcher
+from compat_difflib import SequenceMatcher
 
 TRACE = 0
 

viewcvs-install

@@ -35,7 +35,7 @@ sys.path.insert(0, os.path.join(os.path.dirname(sys.argv[0]), 'lib'))
 
 import compat
 import viewcvs 
-import ndiff
+import compat_ndiff
 version = viewcvs.__version__
 
 
@@ -145,7 +145,7 @@ def InstallFile(src_path, dest_path, mode, set_python_paths, prompt_replace,
   if prompt_replace and os.path.exists(DESTDIR + dest_path):
     # Collect ndiff output from ndiff
     sys.stdout = StringIO.StringIO()
-    ndiff.main([DESTDIR + dest_path,src_path])
+    compat_ndiff.main([DESTDIR + dest_path,src_path])
     ndiff_output = sys.stdout.getvalue()
 
     # Return everything to normal