Moved declaration of sibling_conn inside the if-statement that has the only uses of sibling_conn.  Also deleted several blocks that had been marked obsolete months ago.
Moved declaration of sibling_conn inside the if-statement that has the only uses of sibling_conn.  Also deleted several blocks that had been marked obsolete months ago.

git-svn-id: 602a26e73ae9f2a14e2bb95676f2e137fcc39919@4712 7c0444ca-5550-0410-9008-faecdbe78eb5

dpaiton/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,PetaVision/OpenPV,PetaVision/OpenPV,PetaVision/OpenPV,PetaVision/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,PetaVision/OpenPV