Set mUsingFNVcard4 as well as mUseSingleName when setting given/famil…

…y names.

As far as I can tell, mUseSingleName is not enough; you have to also set mUsingFNVcard4.  In my tests, if I set the 'name' and then changed my mind and set the 'given name' (or family name), no name at all would be written out.

src/sbml/annotation/ModelCreator.cpp

@@ -296,6 +296,7 @@ ModelCreator::setFamilyName(const std::string& name)
     mFamilyName = name;
     mHasBeenModified = true;
     mUseSingleName = false;
+    mUsingFNVcard4 = false;
     return LIBSBML_OPERATION_SUCCESS;
   }
 }
@@ -311,6 +312,7 @@ ModelCreator::setGivenName(const std::string& name)
     mGivenName = name;
     mHasBeenModified = true;
     mUseSingleName = false;
+    mUsingFNVcard4 = false;
     return LIBSBML_OPERATION_SUCCESS;
   }
 }