Make most file opening binary

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Hash: SHA1

Make most file opening binary

This should make Windows happier

manifest hash: 4a906f7c55d8af4e962385c645852d0b3d858b42
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mercurial/hg.py

@@ -279,7 +279,9 b' def opener(base):'
 
         f = os.path.join(p, path)
 
-        if mode != "r":
+        mode += "b" # for that other OS
+
+        if mode[0] != "r":
             try:
                 s = os.stat(f)
             except OSError: