deborphan: 清除不用的库包

平时软件装装删删，总觉得会像磁盘那样有“碎片”，那就是没有用到的包。
而包又分两种，软件和库。软件比较好办，一般能很快发现，但是库就不一样了，一本很难发现。

有了deorphan就好办了，它可以搜到那些库包，用orphaner（一个deborphan的wrapper）还可以方便的删掉。

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