Get a 'graphical' tree-overview of installed packages

Generates a ascii-art-graphical tree of packages and their dependancies.
For example for setxkbmap and xkbcomp

      [~] edwin@k7>pkg_tree 'xkb[cm]'
      setxkbmap-1.0.4
      |\__ kbproto-1.0.3
      |\__ pkg-config-0.23_1
      |\__ xproto-7.0.10_1
      |\__ libXau-1.0.3_2
      |\__ libXdmcp-1.0.2_1
      |\__ libX11-1.1.3_1,1
       \__ libxkbfile-1.0.4
      xkbcomp-1.0.3
      |\__ kbproto-1.0.3
      |\__ pkg-config-0.23_1
      |\__ xproto-7.0.10_1
      |\__ libXau-1.0.3_2
      |\__ libXdmcp-1.0.2_1
      |\__ libX11-1.1.3_1,1
       \__ libxkbfile-1.0.4

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