Themes

- Added the new color.blocking to each theme.  In most cases it is the
  same as color.blocked, with something slightly 'bolder' about it, but
  in the more quirky ones it is the same.  These need tweaking.

doc/rc/dark-blue-256.theme

@@ -70,6 +70,7 @@ color.pri.M=rgb025
 color.pri.L=rgb015
 color.tagged=color246
 color.blocked=white on rgb001
+color.blocking=white on rgb002
 color.project.none=
 color.tag.none=
 color.alternate=on color233