try to fix failures

gridder_cxx.h

@@ -1027,7 +1027,7 @@ cout << "data w range: " << wmin << " to " << wmax << endl;
          y0 = -0.5*ny_dirty*psy;
   double nmin = sqrt(max(1.-x0*x0-y0*y0,0.))-1.;
   double dw = 0.25/abs(nmin);
-  size_t nplanes = max<size_t>(2,((wmax-wmin)/dw+1));
+  size_t nplanes = max<size_t>(2,((wmax-wmin)/dw+2));
   dw=(wmax-wmin)/(nplanes-1);
 
   auto w_supp = gconf.Supp();
@@ -1068,7 +1068,7 @@ cout << "working on w plane #" << iw << " containing " << nvis_plane[iw]
     idx_loc_.resize(nvis_plane[iw]);
     auto idx_loc = mav<uint32_t,1>(idx_loc_.data(), {nvis_plane[iw]});
     for (size_t ipart=0; ipart<nvis; ++ipart)
-      if ((iw>=minplane[ipart]) && (iw<minplane[ipart]+w_supp))
+      if ((int(iw)>=minplane[ipart]) && (iw<minplane[ipart]+w_supp))
         {
         double x=min(1.,2./(w_supp*dw)*abs(wcur-wval[ipart]));
         vis_loc[cnt] = vis[ipart]*kernel(x);
@@ -1120,7 +1120,7 @@ template<typename T> void dirty2vis_wstack(const Baselines<T> &baselines,
          y0 = -0.5*ny_dirty*psy;
   double nmin = sqrt(max(1.-x0*x0-y0*y0,0.))-1.;
   double dw = 0.25/abs(nmin);
-  size_t nplanes = max<size_t>(2,((wmax-wmin)/dw+1));
+  size_t nplanes = max<size_t>(2,((wmax-wmin)/dw+2));
   dw=(wmax-wmin)/(nplanes-1);
 
   auto w_supp = gconf.Supp();
@@ -1171,14 +1171,14 @@ cout << "working on w plane #" << iw << " containing " << nvis_plane[iw]
     idx_loc_.resize(nvis_plane[iw]);
     auto idx_loc = mav<uint32_t,1>(idx_loc_.data(), {nvis_plane[iw]});
     for (size_t ipart=0; ipart<nvis; ++ipart)
-      if ((iw>=minplane[ipart]) && (iw<minplane[ipart]+w_supp))
+      if ((int(iw)>=minplane[ipart]) && (iw<minplane[ipart]+w_supp))
         idx_loc[cnt++] = idx[ipart];
 
 myassert(cnt==nvis_plane[iw],"must not happen 2");
     grid2vis_c(baselines, gconf, const_mav<uint32_t,1>(idx_loc), const_mav<complex<T>,2>(grid), vis_loc, const_mav<T,1>(nullptr,{0}));
     cnt=0;
     for (size_t ipart=0; ipart<nvis; ++ipart)
-      if ((iw>=minplane[ipart]) && (iw<minplane[ipart]+w_supp))
+      if ((int(iw)>=minplane[ipart]) && (iw<minplane[ipart]+w_supp))
         {
         double x=min(1.,2./(w_supp*dw)*abs(wcur-wval[ipart]));
         vis[ipart] += vis_loc[cnt]*kernel(x);