[BRLTTY] xbrlapi: Minor clipboard issues and one small feature request

[Brian Buhrow]

	Hello Dave.  Is there a limit to the length of the message line?
We could strip line feeds from the contents of the cut buffer for purposes
of displaying it on the braille display, replacing them with a marker,
like, " $l " to indicate a line break.  However, this hack assumes there is
no limit to the length of the line in the message buffer.
Just a thought.
-Brian