improve focus handling of comment dialog

- do not loose input dialog when clicking outside of dialog
- focus text field when opening dialog

resolves issue #135
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)
bump version to v0.9.4
Merge remote-tracking branch 'origin/master' into intellij13