ENH: add possibility to enable/disable profiling globally (issue #441)

- use InfoSwitch to disable, or via static method.

- respect the state of the argList banner when deciding to emit
  initialization information. Can otherwise end up with unwanted
  output rubbish on things like foamDictionary and foamListTimes.

etc/controlDict

@@ -40,6 +40,9 @@ InfoSwitches
     writeDictionaries 0;
     writeOptionalEntries 0;
 
+    // Allow profiling
+    allowProfiling  1;
+
     // Allow case-supplied C++ code (#codeStream, codedFixedValue)
     allowSystemOperations   1;
 }