SystemInformation: show a progress bar

For whatever reason, computing all the system information takes several
seconds. So let's report progress as we go.

This might still not be granular enough, depending on which loop(s) are
taking the most time. Can be improved further later as needed.
Merge remote-tracking branch 'upstream/master'
Bump to next development cycle

Signed-off-by: Curtis Rueden <ctrueden@wisc.edu>
Merge remote-tracking branch 'upstream/master'