Let Qt lay out and size elements in FollowStreamDialog. Make it

Let Qt lay out and size elements in FollowStreamDialog. Make it
resizable. Get rid of the group box -- the OS X and Windows HIGs
discourage its use and I'm not sure if it fits the GNOME HIG in this
case either. Make the stream contents monospace. Set the cursor to the
beginning of the text when we follow a stream.

Continue the War On Unnecessary Dialogs. Move "Find"ing from a pop-up
window to the main Follow dialog. Wrap back to the beginning as needed.

Add a "Cancel" button. Make sure it and the escape key work as expected.

svn path=/trunk/; revision=52607