bookmarks: issue a warning if remote doesn't support comparing bookmarks
We want to issue a warning and abort comparing bookmarks if remote doesn't
support it. Otherwise hg out -B will list you outgoing bookmarks that cannot
be pushed to the remote repository using hg push -B.
i18n-pt_BR: synchronized with
ed720c7cc97d
wireproto: catch possible cast error in pushkey
The server can return an unexpected answer like 'ssl required'. We catch those
possible cast errors and abort the operation.