make sure to quote arguments

git-svn-id: https://svn.salilab.org/imp/trunk@16308 e91f8c7b-0e32-4433-a9ac-4502d39a4eab
always build config.hs as scons somehow gets the dependencies wrong when scanning some cpp files and doesn't build them in time

git-svn-id: https://svn.salilab.org/imp/trunk@16309 e91f8c7b-0e32-4433-a9ac-4502d39a4eab