2p-2h Kernel

Data related to PRL 120, 166402 (DOI:https://doi.org/10.1103/PhysRevLett.120.166402).
Densities provided are rs=1…6, in steps of 0.5.

31.8.18: Added new kernel data with a spacing of 0.2rs, starting from 0.8 up to 8rs.