Adding a norm of a general field check, so that for things other than gauge configs there is an analogue of plaquette norm.

Improve argument checking in the BinaryIO.h, as there looks to be some corruption issue intermittently on tesseract jobs.
Not clear where the root bug is.

tests/IO/Test_ildg_io.cc

@@ -53,7 +53,6 @@ int main (int argc, char ** argv)
   GridCartesian     Fine(latt_size,simd_layout,mpi_layout);
   GridCartesian     Coarse(clatt_size,simd_layout,mpi_layout);
 
-
   GridParallelRNG   pRNGa(&Fine);
   GridParallelRNG   pRNGb(&Fine);
   GridSerialRNG     sRNGa;
@@ -94,6 +93,27 @@ int main (int argc, char ** argv)
   _IldgReader.close();
   Umu_diff = Umu - Umu_saved;
 
+  std::cout <<GridLogMessage<<"**************************************"<<std::endl;
+  std::cout <<GridLogMessage<<"** Writing out  ILDG conf    *********"<<std::endl;
+  std::cout <<GridLogMessage<<"**************************************"<<std::endl;
+  file = std::string("./ckpoint_scidac.4000");
+  emptyUserRecord record;
+  ScidacWriter _ScidacWriter(Fine.IsBoss());
+  _ScidacWriter.open(file);
+  _ScidacWriter.writeScidacFieldRecord(Umu,record);
+  _ScidacWriter.close();
+
+  Umu_saved = Umu;
+  std::cout <<GridLogMessage<<"**************************************"<<std::endl;
+  std::cout <<GridLogMessage<<"** Reading back ILDG conf    *********"<<std::endl;
+  std::cout <<GridLogMessage<<"**************************************"<<std::endl;
+  ScidacReader _ScidacReader;
+  _ScidacReader.open(file);
+  _ScidacReader.readScidacFieldRecord(Umu,record);
+  _ScidacReader.close();
+  Umu_diff = Umu - Umu_saved;
+
+
   std::cout <<GridLogMessage<< "norm2 Gauge Diff = "<<norm2(Umu_diff)<<std::endl;
 
   Grid_finalize();