reduced number of repititions in expensive_bd test

git-svn-id: https://svn.salilab.org/imp/trunk@17221 e91f8c7b-0e32-4433-a9ac-4502d39a4eab
add comment about destroying subtree properly

git-svn-id: https://svn.salilab.org/imp/trunk@17223 e91f8c7b-0e32-4433-a9ac-4502d39a4eab
use newlines rather than spaces to join values in cmakelists.txt as that makes the diffs smaller and conflicts fewer

git-svn-id: https://svn.salilab.org/imp/trunk@17224 e91f8c7b-0e32-4433-a9ac-4502d39a4eab
update cmakelists.txt

git-svn-id: https://svn.salilab.org/imp/trunk@17225 e91f8c7b-0e32-4433-a9ac-4502d39a4eab