With selection cuts for ME level

(from jan Winter) Things to notice are: 

(1) the simulation uses massive b quarks right from the hardest level, ie in the MEs, 
(2) for testing purposes, hadronization (FRAGMENTATION=Off;) and underlying event (MI_HANDLER=None;) are switched
 off (once you convinced yourself that everything is going fine, you can remove these commands, also only then it makes sense to start playing with event output) and 
(3) the cards are set such that cross section integration will be optimized, so the 6-particle FS require some good CPU
 time (if you want quick tests in the beginning I suggest to use FINISH_OPTIMIZATION=Off and adjust the "Integration_Error" settings
 accordingly).

 I would also recommend thinking about your selection cuts. As set now they
 are very loose, so as a result you get large cross sections. If your
 selection in the end is more restrictive then it'd be more efficient to
 have more cuts already applied at the generation level.