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/solarized-dark-256.theme

@@ -47,6 +47,7 @@ color.active=bold red
 color.alternate=on black #color0
 
 color.blocked=color0 on color10
+color.blocking=color15 on color10
 
 color.burndown.done=color0 on color4
 color.burndown.pending=color0 on color1