New target macro, STRUCT_FORCE_BLK

[Michael Hayes]

Jeffrey A Law writes:
 > Note this is a performance, not a correctness issue.  I get the opposite
 > impression from the comments in the code and the documentation.  You should
 > clarify the code/docs on this issue.

Yes this is a performance issue.  It would be a correctness issue if I
didn't have a lot of MD hackery to handle this.  With this patch I can
now throw all this hackery out.

 > I don't see a good way to do what you need other than the new
 > macro.  So after the minor updates you should go ahead and install 
 > your change.

Thanks, done.

Michael.