display change # in change detail panel
hide change id and # columns by default

- they can be enabled in settings (requires reload of list)
optimize revision selection column

- move it to last position in column row
- use a bit less horizontal space
optimize size of change subject column

- calculate optimal width for subject up to 80 chars
display account information in Gerrit >= 2.10

- it is broken least with gerrit-review.googlesource.com (empty owner in list)