fix minor bug in __main__

bfps/__main__.py

@@ -50,7 +50,7 @@ def main():
     # error is thrown if first option is not a base class, so Launcher
     # cannot be executed by mistake.
     c = eval('{0}()'.format(opt.base_class))
-    c.launch(sys.argv[2:])
+    c.launch(args = sys.argv[2:])
     return None
 
 if __name__ == '__main__':

bfps/_fluid_base.py

@@ -398,6 +398,7 @@ class _fluid_particle_base(_code):
         return None
     def launch(
             self,
+            args = [],
             **kwargs):
         return None