Python app installs itself in two places - why?

[tinnews at isbd.co.uk]

I have installed an application called pycocuma on my xubuntu 11.10
system.  It works OK and I'm aiming to develop it a little as its
'owner' has long since stopped work on it.

However I'm a little puzzled by the way it has installed itself (it's
a standard package from the Ubuntu repositories), all the python
source is installed in two places:-

    /usr/lib/python2.7/dist-packages/pycocumalib
    /usr/share/pyshared/pycocumalib

All the files in /usr/lib/python2.7/dist-packages/pycocumalib are
actually symbolic links to the ones in /usr/share/pyshared/pycocumalib
but I just wondered why they're in both places.

Is it just 'historic' or is there a good sound reason for it?

-- 
Chris Green