Adding documentation for '@N', inactive color.

FL/Fl_Browser.H

@@ -212,7 +212,8 @@ public:
     and used to modify how the rest of the line is printed:
     
     \li <tt>'\@.'</tt> Print rest of line, don't look for more '\@' signs
-    \li <tt>'\@\@'</tt> Doubling the format character prints the format character once, followed by the rest of line
+    \li <tt>'\@\@'</tt> Doubling the format character prints the format
+      character once, followed by the rest of line
     \li <tt>'\@l'</tt> Use a LARGE (24 point) font
     \li <tt>'\@m'</tt> Use a medium large (18 point) font
     \li <tt>'\@s'</tt> Use a <SMALL>small</SMALL> (11 point) font
@@ -222,6 +223,7 @@ public:
     font (sets font to FL_COURIER)
     \li <tt>'\@c'</tt> Center the line horizontally
     \li <tt>'\@r'</tt> Right-justify the text
+    \li <tt>'\@N'</tt> Use fl_inactive_color() to draw the text
     \li <tt>'\@B0', '\@B1', ... '\@B255'</tt> Fill the backgound with
       fl_color(n)
     \li <tt>'\@C0', '\@C1', ... '\@C255'</tt> Use fl_color(n) to draw the text

test/browser.cxx

@@ -44,6 +44,7 @@ That was a blank line above this.
 @C1RED
 @C2Green
 @C4Blue
+@N@.Inactive
 
 @@ start line with '@'
 @.@ alternative start line with '@'