Allow the user to specify the fallback encoding for the changelog
Example: use EUC-JP instead of ISO-8859-1:
[ui]
fallbackencoding = EUC-JP
adding dir/bar
adding foo
dir/bar
foo
adding dir/bar_2
adding foo_2
dir/bar_2
foo_2
adding a
adding c
adding b
adding d
removing a
removing c
recording removal of a as rename to b (100% similar)