add noradii option to multi-model pdb read

git-svn-id: https://svn.salilab.org/imp/trunk@17422 e91f8c7b-0e32-4433-a9ac-4502d39a4eab
use 2.0.x style version numbers in release

address issue #266

git-svn-id: https://svn.salilab.org/imp/trunk@17423 e91f8c7b-0e32-4433-a9ac-4502d39a4eab