The crystallographic reliability index Rcomplete for
reflections that satisfy the resolution limits
established by _refine_ls_shell.d_res_high and
_refine_ls_shell.d_res_low and the observation limit
established by _reflns.observed_criterion
Ref: Luebben, J., Gruene, T., (2015). Proc.Nat.Acad.Sci. 112(29) 8999-9003