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/light-256.theme

@@ -70,6 +70,7 @@ color.pri.M=color237
 color.pri.L=color242
 color.tagged=rgb020
 color.blocked=gray12 on gray4
+color.blocking=gray12 on gray6
 color.project.none=
 color.tag.none=
 color.alternate=on color254