fix test_relative_mover (old code used obsolete propose_move method)

git-svn-id: https://svn.salilab.org/imp/trunk@17329 e91f8c7b-0e32-4433-a9ac-4502d39a4eab
use test flag to speed up decay example

git-svn-id: https://svn.salilab.org/imp/trunk@17330 e91f8c7b-0e32-4433-a9ac-4502d39a4eab