[FIX] Use the get_python_lib of distutils. This function is very

  useful because it returns the right directory to store the data files
  for OpenERP. This patch fix a bug with the dist-packages directory
  and python 2.6 on Ubuntu >= 9.04

bzr revid: stephane@openerp.com-20100527134232-ah3wotkz5dea7045