解决audacious写入id3tag乱码问题的补丁

首先说一说我对chardet的理解：
如果启用chardet，那么让taglib把所有tag的encoding当做Latin1，然后audacious自己来进行编码侦测。
如果不启用chardet，让taglib把所有tag当UTF8。

相比较amarok，audacious确实给用户多了一种选择。用户可以不转码。转的不"规范"的UTF8编码（也就是只转码，没加encoding byte）的tag也可以显示。
可惜我之前不知道，我用id3v2转了很多mp3，都属于此类情况。
现在我准备向"标准"靠拢。我准备不再用audacious的chardet功能。
我改写了taglib里的例子，用它配合我的id3转码脚本，在结合下面这个网页上的脚本，来把我所有的mp3都转"正确"的编码。
http://paste.ubuntu.org.cn/1090
这样一来amarok里也可以正常显示。否则像现在这样amarok里所有的歌都是乱码，除非不含tag的，可以正确显示文件名。

虽然我不用chardet，不过这个补丁还是要贡献出来。它应该有理由被upstream收录。gentoo-china overlay用户可以直接layman -S后，emerge audacious-plugins
http://gentoo-china-overlay.googlecode.com/svn/trunk/media-plugins/audacious-plugins/files/audacious-plugins-1.2.2-mp3-id3tag-edit.patch

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