Simplify checking of container (List/HashTable, strings) sizes

- can use 'XX.empty()' instead of 'XX.size() == 0', 'XX.size() < 1' or
  'XX.size() <= 0' or for simpler coding.
  It also has the same number of characters as '!XX.size()' and /might/ be
  more readable

- many size checking had 'XX.size() > 0', 'XX.size() != 0', or 'XX.size() >= 1'
  when a simple 'XX.size()' suffices

applications/utilities/surface/surfaceTransformPoints/surfaceTransformPoints.C

@@ -63,7 +63,7 @@ int main(int argc, char *argv[])
     Info<< "Writing surf to " << outFileName << " ..." << endl;
 
 
-    if (args.options().size() == 0)
+    if (args.options().empty())
     {
         FatalErrorIn(args.executable())
             << "No options supplied, please use one or more of "