Refs #8958 Sorted complier warnings

there were a couple of "comparison between signed and unsigned int" warnings.

I also changed a couple of autos to const references of thier actual types on martyn's suggestion.

Code/Mantid/Framework/DataHandling/src/SaveANSTO.cpp

@@ -70,21 +70,21 @@ namespace Mantid
       m_ws = getProperty("InputWorkspace");
       g_log.information("FILENAME: " + filename);
       auto title ='#'+ m_ws->getTitle();
-      auto x1 = m_ws->readX(0);
+      const std::vector<double> & x1 = m_ws->readX(0);
       const size_t xlength = x1.size() - 1;
       std::vector<double> X1;
       X1.resize(xlength, 0);
-      for (int i = 0; i < xlength; ++i)
+      for (size_t i = 0; i < xlength; ++i)
       {
         X1[i]=(x1[i]+x1[i+1])/2.0;
       }
-      auto y1 = m_ws->readY(0);
-      auto e1 = m_ws->readE(0);
+      const std::vector<double> & y1 = m_ws->readY(0);
+      const std::vector<double> & e1 = m_ws->readE(0);
       char sep = '\t';
       double qres = (X1[1]-X1[0])/X1[1];
       g_log.information("Constant dq/q from file: " + boost::lexical_cast<std::string>(qres));
       file << std::scientific;
-      for (int i = 0; i < xlength; ++i)
+      for (size_t i = 0; i < xlength; ++i)
       {
         double dq = X1[i]*qres;
         file << X1[i] << sep << y1[i] << sep << e1[i] << sep << dq << std::endl;