Add a possibility to parse the values of the following form

    rn_pref     = 101000._wp !  reference atmospheric pressure   [N/m2]/
use distribute first, if failed try setuptools, not sure if this change  is solid but work fine for me, added because I could not update the installation with my code modifications otherwise
Merge pull request #3 from guziy/master

Account for numeric options of type 1000._wp and use distribute in setup.py by default.