fix double precision, and remove alloca
increase mass of the load, to show benefits of direct MLCP solver
move damping back to original location

git-svn-id: http://bullet.googlecode.com/svn@2704 08e121b0-ae19-0410-a57b-3be3395fd4fd
2704 is the Bullet 2.82 release (accidently the 2703 revision broke double precision build)

git-svn-id: http://bullet.googlecode.com/svn@2705 08e121b0-ae19-0410-a57b-3be3395fd4fd