Remove unnecessary libs

[Marcus <talos@algonet.se>]

Hi, During time you install and remove things on your computer and thus 
(when uninstalling a program) leaving libs behind that the program 
depends on.
However, now, when the program to which the libs was necessary to is 
gone they are ofcouse no longer needed and only takes up diskspace.
Now, is there a easy way to seach out these libs and purge them with 
dpkg? If not, wouldn't this be a nice feature you think?
Or is there another easy way to resolve the problem in hand?
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