improving function names and docs for SecondaryStructureResidue

git-svn-id: https://svn.salilab.org/imp/trunk@16673 e91f8c7b-0e32-4433-a9ac-4502d39a4eab
suppres error messages in scons

git-svn-id: https://svn.salilab.org/imp/trunk@16674 e91f8c7b-0e32-4433-a9ac-4502d39a4eab
use arguments

git-svn-id: https://svn.salilab.org/imp/trunk@16675 e91f8c7b-0e32-4433-a9ac-4502d39a4eab