Have controller link to neochatconnection for errorOccured rather than call directly to remove dependency on controller.
For all the same reasons as network/neochat!1926
We now remove the header from the page, and replace it with a separator
(it still lives with an InlineMessage for error handling.) The contents
of this page are now centered, and the maximum width of the buttons are
reduced.
Along with that are two smaller misc improvements. One is that the
duplicate separator underneath "Register" is now gone. Another is that
the full settings page may now be opened from here, allowing users to
access more than proxy settings.
