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-yellow-green.theme

@@ -70,6 +70,7 @@ color.pri.M=rgb030
 color.pri.L=rgb010
 color.tagged=rgb342
 color.blocked=white on rgb110
+color.blocking=white on rgb220
 color.project.none=
 color.tag.none=
 color.alternate=on gray0