new colormap options * colormap.m: New options, list, register, and unregister. * NEWS: Note new colormap options. * autumn.m, bone.m, cool.m, copper.m, flag.m, gmap40.m, gray.m, hot.m, hsv.m, jet.m, lines.m, ocean.m, pink.m, prism.m, rainbow.m, spring.m, summer.m, winter: Always size and return 0x3 when size < 1. Include PKD_ADD and PKG_DEL commands to register and unregister colormap funtions.

--- a/scripts/image/rainbow.m	Wed May 16 16:38:39 2012 -0400
+++ b/scripts/image/rainbow.m	Wed May 16 16:52:08 2012 -0400
@@ -31,6 +31,9 @@
 ## this colormap is not part of matlab, it is like the prism
 ## colormap map but with a continuous map
 
+## PKG_ADD: colormap ("register", "rainbow");
+## PKG_DEL: colormap ("unregister", "rainbow");
+
 function map = rainbow (n)
 
   if (nargin == 0)