make appendfile simpler so it does not break with revlogng on windows.
it used to cache open files. this made revlogng break because it wants
to rename files when splitting .i into .i/.d, but cannot rename or unlink
open files on windows.
new code is bit slower, but safe on linux and windows. proper fix for
too many open/close of changelog/manifest belongs in different place.
can get 10% speed improvement back.
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merge: warning: conflicts during merge
merging file1
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diff -r f248da0d4c3e file1
--- a/file1
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@@ -1,3 +1,7 @@ added file1
added file1
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+<<<<<<<
+changed file1 different
+=======
changed file1
+>>>>>>>
M file1
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