Commit to fix bug 241 (improper "using namespace std" in a header). This caused...

Commit to fix bug 241 (improper "using namespace std" in a header).  This caused a number of latent errors in sources and headers to come up.  Those are now fixed (by adding "using" or "std::" depending on the context).  Took the opportunity to bring many rewriter sources in line with coding conventions.