add new monitor mce_stat in the file mercury_mce_stat.hpp
mce_stat works with shared data which is the same to the graviation class
finish some work collision with the central body, wondering if have to use atomicAdd to modify the position and velocity of the planets and the sun
Fixed error to use x,y,z for du0, dv0, dvw0
using shmem per system correctly
Finish the 2-pass algorithm, working with 3 collided planets and testing
Merge branch 'mercury-collision-detection' of https://github.com/AstroGPU/swarm into mercury-collision-detection
Merge pull request #54 from AstroGPU/master

get the python stuff
Testing mercury with the Parabolic collision test passes.
new version of mce_stat
change pass_two to serial, i.e. using only the first thread
remove and add some comments
add cpu version for irk2
finish first draft of irk2, need to debug and test
correct some minor things
add __device__ to coef
update
update
compile successfully with atomicAdd
error in shared variable of mce_stat is fixed