[sldev] Python indra libs

[Domino Marama]

Are the python modules in "linden/indra/lib/python/indra" actually
installed anywhere?

These seem like they should be separate from the main client source and
ideally available via easy_install (.egg) for Python development of
client utilities.

It's something I'll need for my Blender scripts as I add LLSD support,
and I have thought an official Linden package would be more appropriate
than doing my own unofficial one :)