Re-work upload and file processing so they are in the same Python
function. Now I will start exposing other command line options in
the form, like unsafe fixes, excluding fields, etc. Now I see tha
t it is easier to save the POSTed file and process it in the same
function so I don't have to pass around the other POSTed form val
ues as URL query parameters.
Now, as a result of changing the flow above, I also had to make a
change to the way I show the results page. Instead of processing
the file and returning the rendered results to the user directly,
I process the file, save the rendered results to /tmp, and return
a redirect to the user to the results page.