Allow gdb functions to specify where a line should wrap if it

exceeds the size of a terminal line.  Use it to make the output
        prettier.

gdb/doc/gdbint.texinfo

@@ -2,7 +2,7 @@ GDB Internals documentation
 
 This needs to be wrapped in texinfo stuff...
 
-Cleanups
+  Cleanups
 
 Cleanups are a structured way to deal with things that need to be done
 later.  When your code does something (like malloc some memory, or open
@@ -45,6 +45,27 @@ since they might never return to your code (they "longjmp" instead).
 
 
 
+  Wrapping output lines
+
+Output that goes through printf_filtered or fputs_filtered or
+fputs_demangled needs only to have calls to wrap_here() added 
+in places that would be good breaking points.  The utility routines
+will take care of actually wrapping if the line width is exceeded.
+
+The argument to wrap_here() is an indentation string which is printed
+ONLY if the line breaks there.  This argument is saved away and used
+later.  It must remain valid until the next call to wrap_here() or
+until a newline has been printed through the *_filtered functions.
+Don't pass in a local variable and then return!
+
+It is usually best to call wrap_here() after printing a comma or space.
+If you call it before printing a space, make sure that your indentation
+properly accounts for the leading space that will print if the line wraps
+there.
+
+
+
+
   Configuring GDB for release