The scratch directory is created under the project folder.

E.g. show that task is progressing at 5% per hour.
Use the largest time scale (hour, min, sec)
for which the rate is < 100%.

This can be used, e.g. to compare the speed of different
GPUs or app versions for similar jobs.

"Progress rate" is that average increase in fraction done
per second of elapsed time.

Also remove unnecessary destructors in GUI RPC code

- no lines longer than 80 chars
- break fn calls across lines as
    foo(x, y,
        z, w
    );
- no spaces after parens