ENH: silently add "lib" prefix and ".so" suffix for dlOpen'ed libraries

- reduces some dictionary clutter and probably looks less confusing
  than having an ending that may not correspond to the current OS.

  Eg, "fvOptions" instead of "libfvOptions.so", "libfvOptions.dylib" ...

- convenience dlOpen method for multiple files

tutorials/IO/systemCall/system/systemCall

@@ -3,7 +3,7 @@
 system
 {
     type    systemCall;
-    libs    ("libutilityFunctionObjects.so");
+    libs    ("utilityFunctionObjects");
 
     // Execute on the master process only
     master  true;