fixed readme input scripts.

Author: sbryngelson

README.md

@@ -203,16 +203,16 @@ Their contents, and a guide to filling them out, are documented
 in the user manual. A commented, tutorial script
 can also be found in `example_cases/3d_sphbubcollapse`.
 MFC can be executed as  
-`python pre_process`
+`python input.py pre_process`
 
 which will generate the restart and grid files that will be read 
 by the simulation code. Then  
-`python simulation`
+`python input.py simulation`
 
 will execute the flow solver. The last (optional) step
 is to post treat the data files and output HDF5 databases
 for the flow variables via  
-`python post_process`
+`python input.py post_process`
 
 Note that the post-processing step 
 requires installation of Silo and HDF5.