updated logic on finding tower nodes (lowered the tolerance for if we were actually on a node)
updated logic on finding tower nodes (lowered the tolerance for if we were actually on a node)

git-svn-id: 32f9b636991e7a41d75cf9170f3fbddbbc64aa4d@153 a6739609-9c9d-4a29-a9ec-bdd8708b3f03

OpenFAST/OpenFAST,OpenFAST/OpenFAST,OpenFAST/OpenFAST