Get a 'graphical' tree-overview of installed packages
Generates a ascii-art-graphical tree of packages and their dependancies.
For example for itk-3.2_1:
[~] edwin@k7>pkg_tree tk-8
tk-8.3.3
|\__ tcl-8.3.3_3 (unknown)
|\__ imake-4.1.0 (unknown)
|\__ freetype2-2.0.4
\__ XFree86-libraries-4.1.0 (unknown)
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