cd to build dir, out of habit

git-svn-id: https://svn.salilab.org/imp/trunk@16604 e91f8c7b-0e32-4433-a9ac-4502d39a4eab
warn if old style restraints are used

git-svn-id: https://svn.salilab.org/imp/trunk@16605 e91f8c7b-0e32-4433-a9ac-4502d39a4eab
support old restraint constructorrs for isd

git-svn-id: https://svn.salilab.org/imp/trunk@16606 e91f8c7b-0e32-4433-a9ac-4502d39a4eab
make more isd tests pass

git-svn-id: https://svn.salilab.org/imp/trunk@16607 e91f8c7b-0e32-4433-a9ac-4502d39a4eab