Merge pull request #3 from trontrytel/master

pull me
adding all processes to particles_step
fixing rng; wip towards working sd stats
fixing nvcc comaptibility
adding outbuf(); fixing 1+r additions in fake_units
lgrngn: initial import of working advection
wip on blk_2m
Merge branch 'master' of github.com:trontrytel/libcloudphxx