Set height of "Add Reviewer" dialog on /createreview to "fit to content"

Before this fix scrollbars was visible by default in all browsers.
Close "Add Reviewer/Watcher" dialog on ENTER at /createreview
Close "Edit Recipients" dialog on ENTER for /createreview
Make "Add Reviewer/Watcher" modal on both review front page and /createreview
Disable spellchecker in SHA1: field of "Move Rebase" dialog
Make "Edit Owners" dialog on review front page modal
Make "Add Filter" and "Change Password" dialogs modal on /home
Reload after "Rebase Prepared" info dialogs even for ESC and X-button clicks

Since these dialogs are just "fyi", the rebases will be in progress
regardless of which way the user exits the info dialog. Before this
fix the rebase button still said "Prepare Rebase" even though a
rebase was in progress which was slightly confusing.
Don't show non-functional "Exclude me, please!" button for review owners