Provide more symmetric command parsing for sfwriter and sfreader functions

[grumpyinca]

File name should be passed in argument list.

[grumpyinca]

The conversation that prompted me to open this issue assumed that these functions differed in their calling arguments. I just looked at the code. See below. Is it possible that the code got enhanced or is it possible that the issue never really existed in the first place ?

Save.js:
function sfwriter(cpname) {

start.js:
function sfreader(sfname) {

[1fifoto]

The structure of sfwriter and sfreader are different. One does command parsing, but the other doesn't. They should be made similar in this aspect.